Add and Subtract Tens Mentally

 $32\ +10=$  

• 42

• 33

• 65

Tags

CCSS.1.NBT.C.5

 $68\ -\ 20=$  

• 60

• 70

• 48

Tags

CCSS.1.NBT.C.4

CCSS.2.NBT.B.5

 $56-30=$  

• 26

• 36

• 58

Tags

CCSS.2.NBT.B.5

 $35+30=$  

• 5

• 65

• 66

Tags

CCSS.2.NBT.B.5

A store had 53 watches. It sold 30 of them. How many watches are left?

• 23

• 20

• 24

Tags

CCSS.2.OA.A.1

Evelyn is reading a 55 pages book. She is on page 30. How many more pages does she have left to read.

• 85

• 24

• 25

Tags

CCSS.2.OA.A.1

 $52+10=$  

• 70

• 61

• 62

Tags

CCSS.2.NBT.B.5

 $50+40=$  

• 90

• 10

• 91

Tags

CCSS.2.NBT.B.5

10, 20, 30, 40, ..............................

• 80, 90, 100, 110

• 50, 60, 70, 80

• 30, 40, 50, 60

Tags

CCSS.1.NBT.A.1

Kevin has 50 marbles. His mom gave him 30 more marbles. How many marbles does Kevin has now?

• 20

• 80

• 90

Tags

CCSS.2.OA.A.1