1. Showing the Associative Property of Addition

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

3. Supply the missing numbers.
1) 16 + ___ = 23 + 16
2) 24 + 55 = ___ + 24
3) ___ + 28 = 19 + 28
4) 26 + ___ = 56 + 26
5) 69 + 49 = 49 + ___

4. Changing the order of the addends
does not change the sum.
10+ 8
18
8 + 10
18

5. Commutative property of addition

6. Associative Property of Addition
( 4 + 3 ) + 5 = 4 + ( 3 + 5)
7 + 5 = 4 + 8
12 1

7. Give the missing number.
• ( 8 + 3 ) + 5 = 8 + ( 3 + 5 ) = ___
___ + 5 = 8 + ___ = 16
• ( 9 + 4 ) + 6 = 9 + ( 4 + 6 ) = ___
___ + 4 = 9 + ___ = 19

8. 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.

9. 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.

10. What is the associative property of adiition?
Changing the grouping of the addends does not
change the sum.

11. Write the missing number:
• __ + (3 + 4) = 12
(__ + 3) + 4 = 12
• 6 + (__ + 4) = 20
(6 + __) + 4 = 20
• 7 + (9 + __) = 21
(7 + 9) + __ = 21

12. 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 =

13. 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 __________