Adding and Subtracting Whole Numbers Between 20 and 100

74+47=

• 121

• 131

• 141

• 151

45+25

• 70

• 17

• 27

• 77

[29]+[55]

• 64

• 84

• 93

• 37

What is the final step in adding, 34+28+12+8, using the partial sums method?

• Add your tens

• Adding your ones

• Add your sums

• Grab a calculator

23 + 57 =

23 + 22

• 27

• 18

• 45

• 36

63+25=

• 88

• 98

• 97

• 89

21 + 26 =

• 47

• 46

• 48

51+21

25 + 50

• 70

• 75

• 25

• -25