Mental math

53+34

34= 30 + ______

83+_____=87

53+ ______=83

So, 53 + 34 =87

What are the numbers missing in the red line?

• 5

• 14

• 4

• 11

36 + 43

43= 4 +_____

36+ 4 = 40

40 +____= 79

36+43= 79

What does are the missing numbers in the green line?

• 38

• 39

• 40

• 41

34 + 56=_________

Maria has 14 pencils. Robyn has 9 pencils. How many more pencils does Maria have than Robyn?

• 5

• 23

• 10

• 22

74 + 36=

____+ _____=90

4+ 6= 10

90 + 10= 100

Which are the tens?

• 70+ 30

• 80+ 20

• 50+ 50

• 40+ 60

27+42=

20+ 40=60

____ + _____= 9

60 + 9= 69

Which are the ones?

• 8+ 1

• 6+3

• 9+0

• 7+2

Arizona has 15 counties. Connecticut has 8 counties. How many more counties does Arizona have than Connecticut?

• 6

• 10

• 7

• 8

54+23=____

48+36=_____

28 + 25

25= 2 +23

28+ 2 = _____

____ +23= 53

28+25=53

Which are the missing numbers in blue?

• 50

• 20

• 30

• 40