1. Estimation and Computation

2. There is a worksheet to match this slideshow. This slideshow includes 10 problems from the worksheet. Student whiteboards would also work for this activity. FOR EACH PROBLEM: 1.Have students estimate & record the difference. 2.Have them solve the problem. 3.Click to see the solution to the problem so that students can check their estimate.

3. 76.84 - 21.288 A.Less than 20 B.Between 20 and 30 C.Between 31 and 50 D.More than 50

4. 82.657 - 73.878 A.Less than 20 B.Between 20 and 30 C.Between 31 and 50 D.More than 50

5. 55.421 - 52.631 A.Less than 20 B.Between 20 and 30 C.Between 31 and 50 D.More than 50

6. 58.1 - 14.453 A.Less than 20 B.Between 20 and 30 C.Between 31 and 50 D.More than 50

7. 73.726 - 8.925 A.Less than 20 B.Between 20 and 30 C.Between 31 and 50 D.More than 50

8. 69.215 - 51.355 A.Less than 20 B.Between 20 and 30 C.Between 31 and 50 D.More than 50

9. 93.817 - 55.311 A.Less than 20 B.Between 20 and 30 C.Between 31 and 50 D.More than 50

10. 94.497 - 37.831 A.Less than 20 B.Between 20 and 30 C.Between 31 and 50 D.More than 50

11. 88.519 - 0.523 A.Less than 20 B.Between 20 and 30 C.Between 31 and 50 D.More than 50

12. 69.353- 44.833 A.Less than 20 B.Between 20 and 30 C.Between 31 and 50 D.More than 50