Ch 6: Two-Digit Addition and Subtraction

Add. 3 tens + 4 tens= ____. 30 + 40= ____.

• 7 tens; 70

• 6 tens; 60

• 5 tens; 50

Count on to add. What is the sum? 42 + 3 = ___

• 43

• 45

• 49

Add.

• 14

• 16

• 18

What is the answer? 19 + 9 =

• 30

• 28

• 29

Use the number line to subtract. What is the difference? 90- 40= ___

• F. 40

• G. 50

• H. 60

Use related facts to add and subtract. 10 + _______ = 30, 30 – 10 = _______

• A. 20; 20

• B. 15; 15

• C. 10; 10

Subtract. Which is the related addition fact? 70 – 30 = _______

• F. 40 + 20 = 60

• G. 30 + 30 = 60

• H. 30 + 40 = 70

Ben has 40 stickers. He gives 30 stickers to his friend. How many stickers does Ben have left?

• A. 20

• B. 10

• C. 5

There are 30 students in Mrs. Miller’s class. 20 of them are girls. How many of them are boys?

• F. 10

• G. 15

• H. 20