Showing the Associative Property of Addition

Assignment:

• Ben harvested 73 eggplant and 94 pieces of okra. How many pieces of vegetables were harvested? Show your solution in two ways.

Supply the missing numbers.

1) 16 + ___ = 23 + 162) 24 + 55 = ___ + 243) ___ + 28 = 19 + 284) 26 + ___ = 56 + 265) 69 + 49 = 49 + ___

Changing the order of the addends does not change the sum.

10+ 8 18

8 + 1018

Commutative property of addition

Associative Property of Addition

( 4 + 3 ) + 5 = 4 + ( 3 + 5) 7 + 5 = 4 + 8 12 1

Give the missing number.

• ( 8 + 3 ) + 5 = 8 + ( 3 + 5 ) = ___ ___ + 5 = 8 + ___ = 16

• ( 9 + 4 ) + 6 = 9 + ( 4 + 6 ) = ___ ___ + 4 = 9 + ___ = 19

Use the associative property for the following:Use the addends 9,8 and 5. Write two

different sentences the solve each.

Use 35 as your sum. The first addends is 17. What are the two addends, if the second is 2 more than the first addends.

Use the associative property for the following:Use the addends 10,9 and 6. Write two

different sentences the solve each.

Use 36 as your sum. The first addends is 20. What are the two addends, if the second is 4 more than the first addends.

What is the associative property of adiition?

Changing the grouping of the addends does not change the sum.

Write the missing number:

• __ + (3 + 4) = 12 (__ + 3) + 4 = 12

• 6 + (__ + 4) = 20 (6 + __) + 4 = 20

• 7 + (9 + __) = 21 (7 + 9) + __ = 21

Find the sum using the associative property of addition:

1. 8 + 9 + 6 =2. 7 + 3 + 10 =3. 8 + 7 + 12 =4. 9 + 4 + 13 =5. 15 + 8 + 5 =

Assignment: Identify property of addition used in each equation.

1. 3 + 4 = 4 + 3 __________2. 35 + 18 = 18 + 35 _________3. 9 + (8 + 7) = (9 + 8) + 7 __________4. 76 + ( 30 + 70 ) = ( 76 + 30 ) + 70 __________5. 20 + 47 = 47 + 20 __________