| No. |
Title | Add time |
| 1 |  Properties of Addition 6135 | 2006-10-24 22:33:26 |
|
| 2 | Addition of Decimals 2308 | 2006-11-08 18:48:11 |
|
| 3 | Adding Money Amounts 2361 | 2006-11-13 21:30:00 |
|
| 4 | Improving an Estimate of a sum by rounding 2471 | 2006-11-19 12:33:33 |
|
| 5 | Estimating by Front End Estimation 7012 | 2006-11-19 12:50:37 |
|
| 6 | Estimate the sum of two decimals 3558 | 2006-11-19 13:03:19 |
|
| 7 | The Four Basic Operations 3733 | 2006-11-19 13:07:11 |
|
| 8 | Addition with Roman Numerals 2915 | 2006-11-19 13:08:34 |
|
| 9 | Subtracting Money 2438 | 2007-01-18 20:18:53 |
|
| 10 | Subtracting Money 2319 | 2007-01-18 20:18:53 |
|
