Adding and Subtracting Two-Digit Numbers

Can you make a new 10? What is the sum of the model?

• Yes, 45 + 27 = 72

• No, 45 + 27 = 62

• Yes, 45 + 27 = 62

• No, 45 + 27 = 72

What number does this model show?

• 48

• 59

• 60

• 68

What equation does this model show?

• 55 + 10 = 65

• 45 + 5 = 50

• 46 + 10 = 56

• 44 + 5 = 49

How would you write this model in expanded form?

• 10 + 5 = 15

• 30 + 3 = 33

• 25 + 4 = 29

• 20 + 5 = 25

When adding 34 + 29 can you regroup ten ones into a ten?

• Yes, 3 + 2 = 5

• Yes, 4 + 9 = 13

• No, 3 + 2 = 5

• No, 4 + 9 = 13

10 crayons fit in a box. I have 4 boxes. I also have 3 extra crayons. How many crayons do I have?

Which model shows the same amount as this model?

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1.  32 + 37

• 69

• 42

• 102

• 66

Mary had 42 people come to her house for trick or treating before 6 pm. After 6pm she had 39 people come to her house for trick or treating. How many did she have in all?

• 67

• 81

• 32

• 78

23 + 12

• 35

• 55

• 45

• 34