The commutative, associative and identity properties of addition

In this video we show how rearranging numbers doesn't change the sum and how you can regroup numbers to make calculations easier. And last, adding any number to zero will always equal to that same number. These are known as the commutative, associative and identity properties of addition. Awesome, now let's get going!

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Standards addressed

CCSS.MATH.CONTENT.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.

CCSS.MATH.CONTENT.2.NBT.B.7

Add and subtract within 1000, using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction; relate the strategy to a written method. Understand that in adding or subtracting three-digit numbers, one adds or subtracts hundreds and hundreds, tens and tens, ones and ones; and sometimes it is necessary to compose or decompose tens or hundreds.

CCSS.MATH.CONTENT.2.NBT.B.9

Explain why addition and subtraction strategies work, using place value and the properties of operations.

The commutative, associative and identity properties of addition

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Addition - 2nd grade