Канал: Math Mammoth

Regrouping with zero tens, part 2 (3-digit subtraction)

Regrouping with zero tens, part 2 (3-digit subtraction)

Regrouping with zero tens, part 1 (3-digit subtraction)

Regrouping with zero tens, part 1 (3-digit subtraction)

How to use rounded numbers to estimate the answer to word problem (3rd grade math)

How to use rounded numbers to estimate the answer to word problem (3rd grade math)

Rounding two-digit numbers to the nearest ten

Rounding two-digit numbers to the nearest ten

How to check addition problems

How to check addition problems

Write an equation with an unknown for a word problem, part 1

Write an equation with an unknown for a word problem, part 1

Write an equation with an unknown for a word problem, part 2

Write an equation with an unknown for a word problem, part 2

Telling time using "past": how many minutes past/after the hour (2nd grade math lesson)

Telling time using "past": how many minutes past/after the hour (2nd grade math lesson)

$Divide fractions: how many times does it fit? (5th grade math)$

Divide fractions: how many times does it fit? (5th grade math)

$Divide fractions: equal sharing (whole-number divisor)$

Divide fractions: equal sharing (whole-number divisor)

Missing-number puzzles (3rd grade math)

Missing-number puzzles (3rd grade math)

How to subtract a single-digit number from a three-digit number with mental math

How to subtract a single-digit number from a three-digit number with mental math

Choose a number sentence with unknown to match a word problem (3rd grade math)

Choose a number sentence with unknown to match a word problem (3rd grade math)

Add a three-digit and a single-digit number with mental math (3rd grade math)

Add a three-digit and a single-digit number with mental math (3rd grade math)

Write an addition or a subtraction with an unknown for word problems (3rd grade math)

Write an addition or a subtraction with an unknown for word problems (3rd grade math)

Mental math strategy: use an easier problem

Mental math strategy: use an easier problem

Subtract 3-digit numbers with mental math: use place value

Subtract 3-digit numbers with mental math: use place value

Mental subtraction strategy: think of the difference between the numbers

Mental subtraction strategy: think of the difference between the numbers

Mental math strategy: subtract in parts

Mental math strategy: subtract in parts

Mental subtraction strategy: use basic subtraction facts

Mental subtraction strategy: use basic subtraction facts

Puzzle corner: solve for two unknowns using guess & check

Puzzle corner: solve for two unknowns using guess & check

Strategies for mental math: use an easier problem to help you

Strategies for mental math: use an easier problem to help you

Strategies for mental math: add in parts & use a known fact

Strategies for mental math: add in parts & use a known fact

Counting dimes, nickels, and pennies (1st grade math lesson)

Counting dimes, nickels, and pennies (1st grade math lesson)

Learning about quarters (1st grade math lesson)

Learning about quarters (1st grade math lesson)

Practice problems for making money amounts with cents (1st grade math)

Practice problems for making money amounts with cents (1st grade math)

Practice problems with quarters, dimes, nickels, and pennies (1st grade math)

Practice problems with quarters, dimes, nickels, and pennies (1st grade math)

How many hours pass between these times (1st/2nd grade math lesson)

How many hours pass between these times (1st/2nd grade math lesson)

What time is it half an hour later? A whole hour later? (1st grade math)

What time is it half an hour later? A whole hour later? (1st grade math)

Practice problems for telling time: whole and half hours (1st grade math)

Practice problems for telling time: whole and half hours (1st grade math)

Telling time - whole and half hours - minute hand included (1st grade math)

Telling time - whole and half hours - minute hand included (1st grade math)

How to use a chart to convert metric units - super easy!

How to use a chart to convert metric units - super easy!

The basics of the metric system

The basics of the metric system

"How many more" word problem example - Mathy's and Giganto's jumping jacks

"How many more" word problem example - Mathy's and Giganto's jumping jacks

"How many more" word problems and the concept of difference (2nd grade math)

"How many more" word problems and the concept of difference (2nd grade math)

Learn about grams and kilograms on a kitchen scale (3rd grade math)

Learn about grams and kilograms on a kitchen scale (3rd grade math)

Even and odd numbers - can you share evenly?

Even and odd numbers - can you share evenly?

Telling time "till" the hour (2nd grade math lesson)

Telling time "till" the hour (2nd grade math lesson)

What time does Mathy get up, eat lunch, and go to bed? First grade math lesson.

What time does Mathy get up, eat lunch, and go to bed? First grade math lesson.

AM and PM (morning/afternoon hours) - 1st grade math lesson

AM and PM (morning/afternoon hours) - 1st grade math lesson

Tell time to the nearest 5 minutes - with numbers for the minute hand also

Tell time to the nearest 5 minutes - with numbers for the minute hand also

2-digit division with remainders

2-digit division with remainders

Rounding to the nearest hundred: a pictograph

Rounding to the nearest hundred: a pictograph

Round 4-digit numbers to the nearest hundred: practice

Round 4-digit numbers to the nearest hundred: practice

Rounding to the nearest hundred, part 1

Rounding to the nearest hundred, part 1

4-digit numbers: expanded form (3rd grade math lesson)

4-digit numbers: expanded form (3rd grade math lesson)

4-digit place value - thousands - part 2

4-digit place value - thousands - part 2

4-digit place value: thousands (3rd grade math lesson)

4-digit place value: thousands (3rd grade math lesson)

Unit rate word problem: which is a better buy? (7th grade math)

Unit rate word problem: which is a better buy? (7th grade math)

Two quantities, a proportional relationship - example (7th grade math)

Two quantities, a proportional relationship - example (7th grade math)

Proportional relationship or not? Number of ditches vs. number of people digging (7th grade math)

Proportional relationship or not? Number of ditches vs. number of people digging (7th grade math)

Modeling equations with a pan balance: unknowns on both sides

Modeling equations with a pan balance: unknowns on both sides

Modeling equations with a pan balance: several unknowns

Modeling equations with a pan balance: several unknowns

Balance problems and equations: introduction

Balance problems and equations: introduction

Subtracting several numbers: visuals and word problems (1st grade math lesson)

Subtracting several numbers: visuals and word problems (1st grade math lesson)

Subtracting several numbers - practice (1st grade math lesson)

Subtracting several numbers - practice (1st grade math lesson)

Subtracting two numbers - 1st grade math lesson

Subtracting two numbers - 1st grade math lesson

Multi-digit multiplication word problem

Multi-digit multiplication word problem

How many seconds are in a day? (math word problem - multi-digit multiplication)

How many seconds are in a day? (math word problem - multi-digit multiplication)

Multiply with zeros (5th grade math lesson)

Multiply with zeros (5th grade math lesson)

Example: 3-by-4 digit multiplication (5th grade math)

Example: 3-by-4 digit multiplication (5th grade math)

Example: 3-by-3 digit multiplication (5th grade math)

Example: 3-by-3 digit multiplication (5th grade math)

A multiplication word problem (discount) - 5th grade math

A multiplication word problem (discount) - 5th grade math

2-by-2 and 2-by-3-digit multiplication problems

2-by-2 and 2-by-3-digit multiplication problems

How to multiply a money amount (and estimate your final answer)

How to multiply a money amount (and estimate your final answer)

5 and 6 Digit Multiplication (5th grade math)

5 and 6 Digit Multiplication (5th grade math)

Dividing in parts - mental math

Dividing in parts - mental math

Two-digit by two-digit multiplication by partial products

Two-digit by two-digit multiplication by partial products

Partial products - visual model: area of rectangle

Partial products - visual model: area of rectangle

Partial products - multiplying in parts - with mental math

Partial products - multiplying in parts - with mental math

How to calculate mean absolute deviation (6th grade math lesson)

How to calculate mean absolute deviation (6th grade math lesson)

Range and interquartile range - 6th grade math lesson

Range and interquartile range - 6th grade math lesson

Long division with a money amount

Long division with a money amount

Long division - zero in the quotient (4th grade math)

Long division - zero in the quotient (4th grade math)

Long division: 4 and 5-digit dividends

Long division: 4 and 5-digit dividends

Long division - 3-digit dividend

Long division - 3-digit dividend

Long division with 2-digit dividends (4th grade math lesson)

Long division with 2-digit dividends (4th grade math lesson)

How to figure out future or past dates on a calendar (3rd grade math lesson)

How to figure out future or past dates on a calendar (3rd grade math lesson)

$How to cross-cancel when multiplying fractions (aka simplifying criss-cross)$

How to cross-cancel when multiplying fractions (aka simplifying criss-cross)

$How to use factoring to simplify fractions (grade 6 math)$

How to use factoring to simplify fractions (grade 6 math)

Telling time - quarter till and quarter past (3rd grade math)

Telling time - quarter till and quarter past (3rd grade math)

Clock to the Minute, part 2

Clock to the Minute, part 2

Clock to the Minute, Part 1

Clock to the Minute, Part 1

Add and subtract decimals (6th grade math)

Add and subtract decimals (6th grade math)

Decimal place value (6th grade math)

Decimal place value (6th grade math)

Comparing decimals (6th grade math lesson)

Comparing decimals (6th grade math lesson)

Surface area and nets part 2 (6th grade math video)

Surface area and nets part 2 (6th grade math video)

Surface area and nets, part 1 (6th grade math lesson)

Surface area and nets, part 1 (6th grade math lesson)

Introduction to percent (6th grade math lesson)

Introduction to percent (6th grade math lesson)

Percent of a number using decimals - handy trick!

Percent of a number using decimals - handy trick!

Percentage word problems with mental math

Percentage word problems with mental math

How to find a percentage of a number with mental math

How to find a percentage of a number with mental math

Aspect ratio - concept plus word problems (6th grade math lesson)

Aspect ratio - concept plus word problems (6th grade math lesson)

Word problems involving ratios - solved with bar models (part 2)

Word problems involving ratios - solved with bar models (part 2)

Word problems involving ratios - solved with bar models (part 1)

Word problems involving ratios - solved with bar models (part 1)

Graphing equivalent rates (6th grade math)

Graphing equivalent rates (6th grade math)

Using equivalent rates (6th grade math)

Using equivalent rates (6th grade math)

Problem solving - flowchart (6th grade math)

Problem solving - flowchart (6th grade math)

Expanded form (large numbers) and some comparisons (6th grade math)

Expanded form (large numbers) and some comparisons (6th grade math)

Place value and large numbers up to trillions (6th grade math)

Place value and large numbers up to trillions (6th grade math)

A few patterns with exponents (powers of 2 and of 10)

A few patterns with exponents (powers of 2 and of 10)

Introduction to exponents (6th grade math)

Introduction to exponents (6th grade math)

How to round decimals to a given place/digit (5th grade math)

How to round decimals to a given place/digit (5th grade math)

Using random sampling (7th grade math)

Using random sampling (7th grade math)

Basics of random sampling (7th grade math lesson)

Basics of random sampling (7th grade math lesson)

The Pythagorean Theorem and its proof

The Pythagorean Theorem and its proof

The distributive property and equations - pre-algebra lesson

The distributive property and equations - pre-algebra lesson

Review: Adding and Subtracting Whole Tens

Review: Adding and Subtracting Whole Tens

Coordinate grid (first quadrant)

Coordinate grid (first quadrant)

Line graphs (5th grade math)

Line graphs (5th grade math)

Pan balance with a "double scales" - puzzle problems for 4th grade and up

Pan balance with a "double scales" - puzzle problems for 4th grade and up

Pan balance problems - equations with shapes

Pan balance problems - equations with shapes

Subtracting mixed numbers - word problems (4th grade math)

Subtracting mixed numbers - word problems (4th grade math)

$Subtracting fractions and mixed numbers (4th grade)$

Subtracting fractions and mixed numbers (4th grade)

$Multiplying fractions by whole numbers, part 2$

Multiplying fractions by whole numbers, part 2

$Multiplying fractions by whole numbers, part 1 (4th grade math)$

Multiplying fractions by whole numbers, part 1 (4th grade math)

Add and subtract decimals in columns, part 2

Add and subtract decimals in columns, part 2

Add and subtract decimals in columns, part 1

Add and subtract decimals in columns, part 1

Adding decimals mentally, part 2 (4th grade math)

Adding decimals mentally, part 2 (4th grade math)

Adding decimals mentally, part 1 (two decimal digits; grade 4)

Adding decimals mentally, part 1 (two decimal digits; grade 4)

Comparing decimals (two decimal digits... hundredths)

Comparing decimals (two decimal digits... hundredths)

Hundredths - decimals with two decimal digits (4th grade math)

Hundredths - decimals with two decimal digits (4th grade math)

Adding decimals that have tenths (one decimal digit)

Adding decimals that have tenths (one decimal digit)

Decimals that have tenths (one decimal digit) - 4th grade math

Decimals that have tenths (one decimal digit) - 4th grade math

$Comparing fractions 2: Are the wholes the same size? (3rd grade math)$

Comparing fractions 2: Are the wholes the same size? (3rd grade math)

$Comparing fractions with the help of number lines (3rd grade math)$

Comparing fractions with the help of number lines (3rd grade math)

$Comparing fractions: the same kind of parts, or the same amount of parts$

Comparing fractions: the same kind of parts, or the same amount of parts

$Mixed numbers to fractions and vice versa, with VISUAL MODELS$

Mixed numbers to fractions and vice versa, with VISUAL MODELS

Mixed numbers with visual models and on a number line (3rd-4th grade math)

Mixed numbers with visual models and on a number line (3rd-4th grade math)

$Improper fractions on a number line, plus whole numbers as fractions$

Improper fractions on a number line, plus whole numbers as fractions

Fractions on a Number Line (3rd-4th grade math)

Fractions on a Number Line (3rd-4th grade math)

Measuring volume in milliliters and liters (3rd grade math)

Measuring volume in milliliters and liters (3rd grade math)

Pounds and ounces - kitchen scale - 3rd grade math

Pounds and ounces - kitchen scale - 3rd grade math

Cups, pints, quarts, and gallons (third grade math)

Cups, pints, quarts, and gallons (third grade math)

Multiplication is commutative (3rd grade math)

Multiplication is commutative (3rd grade math)

The order of operations - parenthesis, multiplication, addition & subtraction (3rd grade math)

The order of operations - parenthesis, multiplication, addition & subtraction (3rd grade math)

Understanding multiplication word problems, part 2

Understanding multiplication word problems, part 2

Understanding multiplication word problems, part 1

Understanding multiplication word problems, part 1

Multiplication on a Number Line (2nd/3rd grade math)

Multiplication on a Number Line (2nd/3rd grade math)

The order of operations - 3rd grade math (addition, subtraction, parenthesis only)

The order of operations - 3rd grade math (addition, subtraction, parenthesis only)

Mileage chart (3rd grade math lesson)

Mileage chart (3rd grade math lesson)

More Mental Addition and Subtraction (3-digit numbers)

More Mental Addition and Subtraction (3-digit numbers)

Adding money amounts (2nd grade math)

Adding money amounts (2nd grade math)

Dollar amounts (2nd grade math video)

Dollar amounts (2nd grade math video)

Rounding whole numbers - up to six digits (4th grade math)

Rounding whole numbers - up to six digits (4th grade math)

Multiply numbers by 10, 100, and 1000 (and divide also) - 4th grade math

Multiply numbers by 10, 100, and 1000 (and divide also) - 4th grade math

Adding and Subtracting Large Numbers (4th grade math)

Adding and Subtracting Large Numbers (4th grade math)

Introduction to equations (6th grade math)

Introduction to equations (6th grade math)

Addition and Subtraction Facts with 9

Addition and Subtraction Facts with 9

Addition and Subtraction Facts with 6

Addition and Subtraction Facts with 6

Floor plans and scale ratio - 7th grade math

Floor plans and scale ratio - 7th grade math

Adding three or four single-digit numbers Mentally (2nd grade math)

Adding three or four single-digit numbers Mentally (2nd grade math)

Addition & subtraction facts with 8 - fact families approach (1st grade math)

Addition & subtraction facts with 8 - fact families approach (1st grade math)

Addition and subtraction facts with 7 - fact families (1st grade math)

Addition and subtraction facts with 7 - fact families (1st grade math)

"Make a ten" strategy for addition (1st grade math)

"Make a ten" strategy for addition (1st grade math)

Is Math Mammoth a mastery-based or a spiral program?

Is Math Mammoth a mastery-based or a spiral program?

Prime factorization and factor trees (6th grade math)

Prime factorization and factor trees (6th grade math)

How does Math Mammoth curriculum teach math facts?

How does Math Mammoth curriculum teach math facts?

The basics of Math Mammoth curriculum (Light Blue series)

The basics of Math Mammoth curriculum (Light Blue series)

Where to start with Math Mammoth

Where to start with Math Mammoth

Sieve of Eratosthenes (finding prime numbers)

Sieve of Eratosthenes (finding prime numbers)

Graphing linear patterns in the coordinate grid (6th grade math)

Graphing linear patterns in the coordinate grid (6th grade math)

The coordinate grid: word problems & applications (6th grade math)

The coordinate grid: word problems & applications (6th grade math)

How to plot AND reflect points on the coordinate grid (all four quadrants) (6th grade math)

How to plot AND reflect points on the coordinate grid (all four quadrants) (6th grade math)

Customary and metric units: word problems

Customary and metric units: word problems

Convert between customary and metric measurement units

Convert between customary and metric measurement units

Convert metric units of measurement - several methods (6th grade math)

Convert metric units of measurement - several methods (6th grade math)

Rounding and estimating with measurements (5th grade math)

Rounding and estimating with measurements (5th grade math)

Multiplication as scaling / resizing (5th grade math)

Multiplication as scaling / resizing (5th grade math)

Fractions are divisions: word problems (5th grade math)

Fractions are divisions: word problems (5th grade math)

Fractions are divisions (5th grade math)

Fractions are divisions (5th grade math)

Convert customary measuring units: word problems (6th grade math)

Convert customary measuring units: word problems (6th grade math)

Convert customary units - weight, length, capacity (6th grade math)

Convert customary units - weight, length, capacity (6th grade math)

$A fraction word problem: aspect ratio of a rectangle (6th grade math)$

A fraction word problem: aspect ratio of a rectangle (6th grade math)

$Word problem: find the total when given a fractional part (6th grade math)$

Word problem: find the total when given a fractional part (6th grade math)

$Word problem: fractional part of a whole (bar model helps!)$

Word problem: fractional part of a whole (bar model helps!)

$Word problem: fraction division (6th grade math)$

Word problem: fraction division (6th grade math)

$Reciprocal numbers and the shortcut for fraction division (grade 5)$

Reciprocal numbers and the shortcut for fraction division (grade 5)

$Reciprocal numbers and why the shortcut for fraction division works$

Reciprocal numbers and why the shortcut for fraction division works

$Division of fractions: concepts and applications, part 2 (6th grade math)$

Division of fractions: concepts and applications, part 2 (6th grade math)

$Division of fractions: concept and applications, part 1 (6th grade math)$

Division of fractions: concept and applications, part 1 (6th grade math)

Draw a square with a given side, and copy a triangle (geometry drawing problems)

Draw a square with a given side, and copy a triangle (geometry drawing problems)

Draw a hexagon and measure its angles - geometry problem 5th grade

Draw a hexagon and measure its angles - geometry problem 5th grade

Examples of calculator usage: word problems (5th grade math)

Examples of calculator usage: word problems (5th grade math)

How to use the calculator to find powers of seven (5th grade math)

How to use the calculator to find powers of seven (5th grade math)

Rounding large numbers - 5th grade math

Rounding large numbers - 5th grade math

Powers of ten and exponents - 5th grade math

Powers of ten and exponents - 5th grade math

Adding and Subtracting Large Numbers (5th grade math)

Adding and Subtracting Large Numbers (5th grade math)

Word problems - mental math - 4-digit numbers (3rd grade math)

Word problems - mental math - 4-digit numbers (3rd grade math)

Addition and subtraction - mental math (4-digit numbers)

Addition and subtraction - mental math (4-digit numbers)

A lesson on estimation - add/subtract 4-digit numbers (3rd grade math)

A lesson on estimation - add/subtract 4-digit numbers (3rd grade math)

Quadrilaterals - 3rd grade geometry lesson

Quadrilaterals - 3rd grade geometry lesson

Find the perimeter of shapes - simple problems (3rd grade math)

Find the perimeter of shapes - simple problems (3rd grade math)

Concept of perimeter (3rd grade math)

Concept of perimeter (3rd grade math)

Problems to solve: area of rectangles (3rd grade math)

Problems to solve: area of rectangles (3rd grade math)

Units of area: square inch, square cm, square feet (3rd grade math)

Units of area: square inch, square cm, square feet (3rd grade math)

Multiplication as repeated addition (2nd grade math)

Multiplication as repeated addition (2nd grade math)

Strategies for mental subtraction, part 2

Strategies for mental subtraction, part 2

Strategies for mental subtraction, part 1 (grades 2-3)

Strategies for mental subtraction, part 1 (grades 2-3)

Word problems and puzzles - 3-digit subtraction (2nd grade math)

Word problems and puzzles - 3-digit subtraction (2nd grade math)