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Domain Operations and Algebraic Thinking
Grade 1
Cluster Understand and apply properties of operations and the relationship between addition and subtraction.
Standard Apply properties of operations as strategies to add and subtract.<span class='footnote'>Students need not use formal terms for these properties.</span> <span class='clarification'>Examples: If $8 + 3 = 11$ is known, then $3 + 8 = 11$ is also known. (Commutative property of addition.) To add $2 + 6 + 4$, the second two numbers can be added to make a ten, so $2 + 6 + 4 = 2 + 10 = 12$. (Associative property of addition.)</span>
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Alignments to Content Standards: 1.OA.B.3
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Abel said,

How 6 + 6 should be 11: 

Because 5 + 5 is 10 and 6 is one more than 5 and 11 is one more than 10. That’s why 6 + 6 should be 11.

 

Rula said,

How 6 + 6 should be 12:

Because 5 + 5 is 10 and the sixes don’t have room to get in and it’s two sixes right, so

||

that is why 6 + 6 should be 12.

 

Who is right?

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Doubles?

Abel said,

How 6 + 6 should be 11: 

Because 5 + 5 is 10 and 6 is one more than 5 and 11 is one more than 10. That’s why 6 + 6 should be 11.

 

Rula said,

How 6 + 6 should be 12:

Because 5 + 5 is 10 and the sixes don’t have room to get in and it’s two sixes right, so

||

that is why 6 + 6 should be 12.

 

Who is right?

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