| No. |
Title | Add time |
| 1 |  Properties of Addition 7565 | 2006-10-24 22:33:26 |
|
| 2 | Addition of Decimals 3412 | 2006-11-08 18:48:11 |
|
| 3 | Adding Money Amounts 3537 | 2006-11-13 21:30:00 |
|
| 4 | Improving an Estimate of a sum by rounding 3676 | 2006-11-19 12:33:33 |
|
| 5 | Estimating by Front End Estimation 8204 | 2006-11-19 12:50:37 |
|
| 6 | Estimate the sum of two decimals 4770 | 2006-11-19 13:03:19 |
|
| 7 | The Four Basic Operations 5119 | 2006-11-19 13:07:11 |
|
| 8 | Addition with Roman Numerals 4031 | 2006-11-19 13:08:34 |
|
| 9 | Subtracting Money 3609 | 2007-01-18 20:18:53 |
|
| 10 | Subtracting Money 3472 | 2007-01-18 20:18:53 |
|
