NUMERICAL ESTIMATION STRATEGIES 10 b

ANSWER SHEET: This sheet gives you the answers to Worksheet #4 for this concept/skill.

Remember that it is important to round your numbers before performing any operations to solve the problem.

Answers to Worksheet #4:

1. The difference between the two temperatures is about 20°F. First, I rounded 73°F down to 70°F. Next, I rounded 54°F down to 50°F. Finally, I subtracted 50°F from 70°F to get the answer 20°F.

2. Jack has about 110 books. First, I rounded 74 down to 70. Next, I rounded 38 up to 40. Finally, I added 70 and 40 to get the answer 110.

3. There were about 210 people at the picnic. First, I rounded 65 up to 70. Next, I rounded 138 up to 140. Finally, I added 70 and 140 to get the answer 210.

4. There were about 500 tickets sold. First, I rounded 346 down to 300. Next, I rounded 172 up to 200. Finally, I added 300 and 200 to get the answer 500.

5. There were about 40 points scored during the football game. First, I rounded 28 up to 30. Next, I rounded 14 down to 10. Finally, I added 30 and 10 to get the answer 40.

6. Fernando needs about 120 rolls. First, I rounded 56 up to 60. Next, I rounded 63 down to 60. Finally, I added 60 and 60 to get the answer 120.

7. The tape is about 200 inches long. First, I rounded 125 up to 130. Next, I rounded 73 down to 70. Finally, I added 130 and 70 to get the answer 200.

8. There were about 40 flowers in the bouquet. First, I rounded 13 down to 10. Next, I rounded 26 up to 30. Finally, I added 10 and 30 to get the answer 40.

9. There were about 600 cartons of milk sold. First, I rounded 314 down to 300. Next, I rounded 275 up to 300. Finally, I added 300 and 300 to get the answer 600.

10. Michael has about 150 stickers. First, I rounded 83 down to 80. Next, I rounded 49 up to 50. Finally, I added 80 and 50 to get the answer 130.