Problem Solving for Unknown Numbers

What is the unknown number?

17-8=?

8+?=17

Tags

CCSS.2.OA.A.1

What is the unknown number?

11-3=?

3+?=11

Tags

CCSS.2.OA.A.1

What is the unknown number?

8-5=?

5+?=8

Tags

CCSS.2.OA.A.1

What is the unknown number?

14-7=?

7+?=14

Tags

CCSS.2.OA.A.1

What is the related addition fact for

15-9=6

• 9+6=15

• 10+5=15

• 15-6=9

• 8+7=15

Tags

CCSS.2.NBT.B.5

What is the related addition fact for

14-6=8

• 14-8=6

• 8+6=14

• 13+1=14

• 8+5=13

Tags

CCSS.2.NBT.B.5