Two Digit Addition- Estimating

42 + 21 is about ______.

• 90

• 60

• 20

16 + 65 is about _______.

• 90

• 30

• 50

39 + 37 is about _____

• 80

• 40

• 20

53 + 32 is about ______

• 80

• 20

• 40

81 + 8 is about _____

• 90

• 40

• 20

9 + 9 is about ____

• 20

• 50

• 90

74 + 21 is about ____

• 90

• 70

• 30

44 + 44 is about _____

• 80

• 40

• 10

35 + 28 is about ____

• 70

• 30

• 90

26 + 31 is about _____

• 60

• 20

• 80