Knowing how to subtract - Common Core: Kindergarten Math

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Question

Use the triangles Screen shot 2015 08 20 at 11.07.59 ambelow to help you answer the subtraction problem.

Screen shot 2015 08 21 at 11.47.16 am

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Answer

We have triangle and we want to subtract triangle, which means the same thing as take it away. We can cross off the triangle that we are subtracting, and count the number that we have left.In this case we have no triangles left. Subtraction is like counting backwards. We can start at and count back .

Screen shot 2015 08 21 at 11.48.58 am

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