December 4: Adding & Subtracting 2-Digit Numbers

Jessica added 27 + 3 + 50 + 2 mentally. What number was she adding to 27?

27 + ____

• 50

• 55

• 53

• 52

Tags

CCSS.1.OA.C.6

CCSS.2.OA.B.2

Choose a way to add 45 + 38 mentally.

• 45 + 40 - 2

• 45 + 40 + 2

• 45 + 20 + 2 + 2

• 50 + 40 + 5 + 2

Tags

CCSS.2.NBT.B.6

Jackson is adding 56 + 37 mentally. Choose the mental math strategy that would work

• 56 + 4 + 30 + 7

• (56 + 3) + (37 + 3) = 59 +40

• 56 + 4 + 30 + 3

Tags

CCSS.2.NBT.B.7

Jaylen subtracted a number from 76 in parts mentally like this:

76 - 6 - 30 - 3

What number was he subtract from 76?

76 - ____ ?

Tags

CCSS.1.OA.C.6

CCSS.2.OA.B.2

Fatima subtracted 92 - 56 by adding up from 56 to 92 in parts mentally like this:

56 + 4 + 30+ ____ =92

What is the missing part?

Tags

CCSS.1.NBT.C.4

CCSS.2.MD.B.6

Choose a way to subtract 87 - 38 mentally.

• 87 - 40 - 2

• (87 + 2) - (38 + 2) = 89 - 40

• 87- 40 + 3

Tags

CCSS.2.NBT.B.5

93 - 57 = ?

Tags

CCSS.2.NBT.B.5

48 + 37 = ?

Tags

CCSS.2.NBT.B.5

64 - 49 = ?

Tags

CCSS.2.NBT.B.5

53 + 28 = ?

Tags

CCSS.2.NBT.B.5