Name:    Lesson 6 - Estimating Differences

1.

Use the number line to select the more reasonable estimate for the difference 83 - 47.
 a. 20 c. 40 b. 30 d. 50

2.

Use the number line to select the more reasonable estimate for the difference 78 - 32.
 a. 30 c. 50 b. 40 d. 60

3.

Use the number line to select the more reasonable estimate for the difference 64 - 27.
 a. 20 c. 40 b. 30 d. 50

4.

Use the number line to select the more reasonable estimate for the difference 91 - 44.
 a. 30 c. 50 b. 40 d. 60

5.

Jordan has \$27. She spends \$16. About how much money does Jordan have left?
 a. 30 - 10 = 20; Jordan has about \$20 left. b. 20 - 20 = 0; Jordan has no money left. c. 20 - 10 = 10; Jordan has about \$10 left. d. 30 - 20 = 10; Jordan has about \$10 left.

6.

A box contains 83 linking pieces. Kim-Li use 52 to build a truck. About how many blocks are left in the box?
 a. 80 - 60 = 20; about 20 pieces are left in the box. b. 90 - 50 = 40; about 40 pieces are left in the box. c. 80 - 50 = 30; about 30 pieces are left in the box. d. 90 - 60 = 30; about 30 pieces are left in the box.

7.

Dina is reading a book with 93 pages. She has read 38 pages. About how many does she have left to read?
 a. 90 - 40 = 50; Dina has about 50 pages left to read. b. 90 - 30 = 60; Dina has about 60 pages left to read. c. 100 - 40 = 60; Dina has about 60 pages left to read. d. 100 - 30 = 70; Dina has about 70 pages left to read.

8.

Charles has sold 28 of the 52 boxes of juice. About how many boxes does he have left to sell?
 a. 50 - 20 = 30; Charles has about 30 boxes left to sell. b. 60 - 30 = 30; Charles has about 30 boxes left to sell. c. 60 - 20 = 40; Charles has about 40 boxes left to sell. d. 50 - 30 = 20; Charles has about 20 boxes left to sell.

9.

A movie is 87 min long. Caitlin has watched 33 min of it. About how much time is left to the movie?
 a. 80 - 30 = 50; About 50 min are left in the movie. b. 90 - 30 = 60; About 60 min are left in the movie. c. 90 - 40 = 50; About 50 min are left in the movie. d. 80 - 40 = 40; About 40 min are left in the movie.