Common Core: Kindergarten Math : Represent Addition and Subtraction in Various Forms: CCSS.Math.Content.K.OA.A.1

Study concepts, example questions & explanations for Common Core: Kindergarten Math

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Example Questions

Example Question #1 : Understanding Addition And Subtraction

Add the triangles Screen shot 2015 08 20 at 11.07.59 ambelow. 


Screen shot 2015 08 20 at 11.52.36 am

Possible Answers:

Correct answer:

Explanation:

When we add we count up. We have  triangle in the first box, and then  triangles in the second box. In total we have  triangles. If you start at  on a number line and count up , you have .

Screen shot 2015 08 20 at 11.58.41 am

Example Question #2 : Understanding Addition And Subtraction

Add the triangles Screen shot 2015 08 20 at 11.07.59 ambelow. 

Screen shot 2015 08 20 at 2.54.55 pm

Possible Answers:

Correct answer:

Explanation:

When we add we count up. We have  triangles in the first box, and then  triangles in the second box. In total we have  triangles. If you start at  on a number line and count up , you have .

Screen shot 2015 08 20 at 2.58.17 pm

Example Question #1 : Operations & Algebraic Thinking

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 12.23.37 pm

Possible Answers:

Correct answer:

Explanation:

We have  triangles and we want to subtract  triangle, which means the same thing as take them away. We can cross off the  triangle that we are subtracting, and count the number that we have left. In this case we have  triangles left. Subtraction is like counting backwards. We can start at  and count back .

Screen shot 2015 08 21 at 12.23.53 pm

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