IXL | Use properties to add three decimals

Use properties to find the sum. Fill in the missing numbers.

12.3

20.6

14.4

12.3

20.6

12.3

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Learn with an example

question

Use properties to find the sum. Fill in the missing numbers.

15.6

22.7

16.4

15.6

22.7

key idea

Commutative property of addition

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

Example:

8.2

5.4

8.2

Associative property of addition

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

Example:

(

4.5

3.1

)

5.9

4.5

(

3.1

5.9

)

solution

Find the sum. You can use properties of addition to make the problem easier.

15.6

22.7

16.4

15.6 and 16.4 are easier to add. So, use the commutative property to reorder the numbers.

15.6

22.7

16.4

15.6

16.4

22.7

Now, add the numbers from left to right.

15.6

22.7

16.4

15.6

16.4

22.7

54.7

Looking for more? Try these:

Lesson: Adding decimals

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Teacher tools

Work it out

Not feeling ready yet? These can help:

AA.2Add decimal numbers

B.7Add using properties

Lesson: Adding decimals

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