NUMERICAL ESTIMATION STRATEGIES 10b

ANSWER SHEET: This answer sheet gives you the answers to worksheet #1 for this concept/skill.

Answers to Worksheet #1:

1. The difference between the two temperatures is about 60°F. First, I rounded 85°F up to 90°F. Next, I rounded 27°F up to 30°F. Finally, I subtracted 30°F from 90°F to get the answer 60°F.

2. Fidel has about 110 pieces of candy. First, I rounded 66 up to 70. Next, I rounded 41 down to 40. Finally, I added 70 and 40 to get the answer 110.

3. There were about 500 raffle tickets sold at the school fair. First, I rounded 129 down to 100. Next, I rounded 410 down to 400. Finally, I added 100 and 400 to get the answer 500.

4. The third grade ate about 130 muffins. First, I rounded 56 up to 60. Next, I rounded 72 down to 70. Finally, I added 60 and 70 to get the answer 130.

5. The class won about 30 ribbons. First, I rounded 12 down to 10. Next, I rounded 17 up to 20. Finally, I added 10 and 20 to get the answer 30.

6. Donna needs about 160 chairs. First, I rounded 79 up to 80. Next, I rounded 82 down to 80. Finally, I added 80 and 80 to get the answer 160.

7. The string is about 210 inches long. First, I rounded 92 down to 90. Next, I rounded 124 down to 120. Finally, I added 90 and 120 to get the answer 210.

8. There were about 300 flowers sold. First, I rounded 114 down to 100. Next, I rounded 215 down to 200. Finally, I added 100 and 200 to get the answer 300.

9. There were about 140 cookies sold at the bake sale. First, I rounded 72 down to 70. Next, I rounded 67 up to 70. Finally, I added 70 and 70 to get the answer 140.

10. Miguel has about 70 baseball cards. First, I rounded 49 up to 50. Next, I rounded 22 down to 20. Finally, I added 50 and 20 to get the answer 70.