👍AoPS offers the best variety of solutions
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2020 AMC10A Probs/Solns
🤔 Why Choose Three?
Three is a good choice for most problems. Three cases allow you to identify patterns with the minimum amount of work; two usually doesn't suffice. From there you can often extend the observed pattern to all cases, but you can always add a fourth case if needed.
🤔 Choose the Easiest Stacking
This problem describes a more general stacking condition, but that doesn't mean you have to solve the general stacking condition, so stack the blocks as conveniently as possible. In the AMC, if a problem question allows a free choice then try to make the easiest choice possible.
⬛ ⚫ Drawing 3D Geometric Shapes
An essential skill for 3D problems and many STEM courses. Need to draw cubes, pyramids, cylinders, cones and spheres with and without hidden edges. Practice drawing combinations and slices of objects. Easier to learn by drawing on graph paper, example pdf:
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Lots of vids on this topic, one for starters:
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(annoying intro, but good otherwise)
⏱Playback Speed
Audio pace is good for careful study or foreign-language students, too slow for most U.S. students. 1.5x playback speed is common among highschoolers.
Good luck on the upcoming AMC's!
💜 Walt S.
