Mental strategies for addition and subtraction

Choose the question that give  you 15

• 11 - 1 + 5

• 20 - 10 + 10

• 10 + 6

• 19 - 8

Tags

CCSS.1.OA.A.1

Choose the question that give  you 17

• 10 + 6 + 2

• 19 - 9 + 6

• 20 - 5 + 1

• 6 +4 +7

Tags

CCSS.1.OA.A.1

CCSS.1.OA.A.2

CCSS.1.OA.C.6

10 + 3 + 2 =

• 15

• 19

• 14

• 20

Tags

CCSS.1.OA.A.1

CCSS.1.OA.A.2

CCSS.1.OA.C.6

9 - 4 + 5 =

• 14

• 5

• 10

• 15

Tags

CCSS.1.OA.A.1

CCSS.1.OA.C.6

CCSS.1.OA.D.7

13 - 3 + 10 =

• 20

• 16

• 10

• 23

Tags

CCSS.1.OA.A.1

CCSS.1.OA.C.6

Choose the question that give  you 19

• 10 - 4

• 20 - 10 + 9

• 20 - 10

• 19 - 9 + 5

Tags

CCSS.1.OA.A.1

CCSS.1.OA.C.6