Add within 100 on an open number line

In this lesson, you will add numbers within 100 by using an open number line.

ADDITIONAL MATERIALS

Lesson slides [ Ссылка ]

STANDARDS

CCSS.2.NBT.B.5 Fluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction.

TEKS.2.4.B add up to four two-digit numbers and subtract two-digit numbers using mental strategies and algorithms based on knowledge of place value and properties of operations;

TEKS.2.4.A recall basic facts to add and subtract within 20 with automaticity;

TEKS.1.5.F determine the unknown whole number in an addition or subtraction equation when the unknown may be any one of the three or four terms in the equation; and

IN.2.CA.1 Add and subtract fluently within 100.

VA.CE.2.6.b determine sums and differences, using various methods; and

VA.CE.2.5.b demonstrate fluency with addition and subtraction within 20.

VA.CE.2.5.a recognize and use the relationships between addition and subtraction to solve single-step practical problems, with whole numbers to 20; and

FL.MAFS.2.NBT.2.5 Fluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction.

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