| No. |
Title | Add time |
| 1 |  Mentally Adding Two-Digit Numbers 3880 | 2006-10-02 20:13:55 |
|
| 2 | Adding Two-Digit Numbers with Paper and Pen... 3568 | 2006-10-02 20:25:19 |
|
| 3 | Estimating a sum by rounding 3742 | 2006-10-04 13:23:49 |
|
| 4 | Front End Estimation of Sums 7440 | 2006-10-04 13:32:06 |
|
| 5 | Add three 2-digit Numbers 3620 | 2006-10-17 16:02:05 |
|
| 6 | Adding Three Digit Numbers 3141 | 2006-10-17 16:07:35 |
|
| 7 | Adding Numbers Arranged Vertically 3169 | 2006-11-04 20:39:54 |
|
| 8 | Changing Hours and Minutes to Minutes 3273 | 2006-11-14 22:08:49 |
|
| 9 | Addition of Hours and Minutes 4807 | 2006-11-18 22:12:00 |
|
| 10 | Add hours 3103 | 2006-11-18 22:40:56 |
|
| 11 | Add half hours 1853 | 2006-11-18 22:42:53 |
|
| 12 | Place Values by Adding 1881 | 2006-11-19 13:05:38 |
|
| 13 | Addition equations with 2 digit numbers 1789 | 2006-11-24 19:05:52 |
|
| 14 | Addition equations with 3 digit numbers 1789 | 2006-11-24 19:06:54 |
|
| 15 | Adding Fractions with the same Denominator 1931 | 2006-11-27 19:37:05 |
|
| 16 | Subtraction Equations - Two Digit Numbers 2522 | 2006-12-14 22:44:16 |
|
| 17 | Estimating a difference by rounding 2860 | 2006-12-15 22:43:23 |
|
| 18 | Subtracting Two-Digit Numbers with a calcul... 1936 | 2006-12-16 22:23:57 |
|
| 19 | Subtraction of Three Digit Numbers 1821 | 2007-01-11 20:01:55 |
|
| 20 | Subtracting Two-Digit Numbers with a calcul... 1772 | 2006-12-16 22:23:57 |
|
