IXL | Add using properties

Use properties to find the sum.

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question

Use properties to find the sum.

key idea

Commutative property of addition

You can add numbers in any order and get the same sum.

Example: 14 + 2 = 2 + 14

Associative property of addition

You can group the addends with parentheses and get the same sum.

Example: 2 + ( 3 + 7 ) = ( 2 + 3 ) + 7

Identity property of addition

Adding zero does not change a number.

Example: 9 + 0 = 9

solution

Use the properties to find the sum of

Look for the numbers that are easier to add.

First, use the commutative property to reorder the numbers.

Then, use the associative property to group the numbers.

(

)

Use mental math to add 45 and 85.

130

Finally, add 23 and 130.

153

So,

153

Looking for more? Try these:

Lesson: The commutative property

Lesson: The associative property

Lesson: The identity property

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Teacher tools

Work it out

Not feeling ready yet? These can help:

B.6Properties of addition

Lesson: The commutative property

Lesson: The associative property

Lesson: The identity property

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