Addition and Subtraction to 20

If you know that 14 + 6 = 20, what else do you know?

• 20 + 14 = 6

• 20 - 14 = 6

• 14 - 20 = 6

• 6 - 14 = 20

Tags

CCSS.1.OA.B.3

Which three pairs of numbers all add up to 20?

• 19 + 1

  17 + 3

  5 + 15

• 12 + 9

  11 + 7

  3 + 16

• 7 + 20

  6 + 12

  7 + 19

• 4 + 12

  16 + 8

  20 + 1

Tags

CCSS.1.OA.A.1

Which of the following is true?

• 2 + 18 = 20 so 20 + 18 = 2

• 2 + 18 = 20 so 18 + 2 = 20

• 2 + 18 = 20 so 20 + 2 = 18

• 2 + 18 = 20 so 18 + 20 = 2

Tags

CCSS.1.OA.B.3

Which 'family' of facts is incorrect?

• 2 + 18 = 20

  18 + 2 = 20

  20 - 18 = 2

  20 - 2 = 18

• 16 + 5 = 20

  5 + 16 = 20

  20 - 16 = 5

  20 - 5 = 16

• 5 + 15 = 20

  15 + 5 = 20

  20 - 5 = 15

  20 - 15 = 5

• 10 + 10 = 20

  20 - 10 = 10

Tags

CCSS.2.NBT.B.5

Which number is missing: 17 + ? = 20

• 5

• 9

• 7

• 3

Tags

CCSS.1.OA.D.8

Which number fact is correct?

• 11 + 9 = 20

• 11 - 6 = 17

• 4 + 14 = 20

• 8 + 8 = 17

17 – 9 =

• 10

• 8

• 7

• 8

Tags

CCSS.2.OA.A.1

15 - 3 =

• 8

• 6

• 12

• 10

Tags

CCSS.1.OA.C.6

10 + 10 = ?

• 20

• 12

• 40

• 30

Tags

CCSS.1.OA.C.6

CCSS.2.OA.B.2

Which number is missing: 4 + ? = 4

• 4

• 1

• 0

• 2

Tags

CCSS.1.OA.B.3