Using Addition to Subtract Doubles

12 - 6 = ____ so then, _____ + ______ = ______

• 12-6=4 so then, 4 +4=10

• 12 - 6 = 6 so then, 6 + 6= 12

• 12-6 = 12 so then, 12 + 12 = 12

• 12 - 5 = 10 so then, 5 + 5 = 10

What addition doubles fact will help you find the answer to 14 - 7?

• 8 + 9=

• 14 - 7 =

• 7 + 7 =

• 6 + 6

What addition doubles fact will help you solve 18 - 9?

• 8+8=16

• 9+9=20

• 8+8=18

• 9+9=18

Will 5 + 5 = 10 help you find 8 - 4?

• yes

• no

David had 18 soccer balls. He lost 9 balls. Which doubles fact can help you find how many balls are left?

• 18 +9= 27

• 0+9=9

• 9+9=18

• 9-9=0

14-7= ____ so then ___ +____= ______

• 14-7=15, so then 7 + 7=15

• 14-7= 8 , so then 8+8=14

• 14-7=7, so then 7+7=14

• 14-2-12, so then 6+6=12

Maria has 6 oranges. She gives 3 oranges to Joe. How many oranges doe she have left? Choose the doubles fact that helped you solve this problem.

• 3+3=6

• 4-3=1

• 6-5=1

• 10-4=6

Jake has 12 pears. He shares 6 pears with Sasha. How many pears does Jake have now? What doubles fact can help you solve this problem?

• 6+6=12

• 8+4=12

• 9+3=12

• 10+2=12

If 18-9= ___, so then ____ = ____=___

• 10-9=7, so then 7+7=14

• 18-9=9, so then 9+9=18

• There is no doubles fact to help,

• The answer is 0,

Megan has 8 flowers. She shares 4 flowers with Nick. How many flowers do they have each? What addition fact can help solve this subtraction problem presented by this story?

• 3+3=6

• 4+4=8

• 9+9=18

• 5+5=10