| No. |
Title | Add time |
| 1 |  Mentally Adding Two-Digit Numbers 1193 | 2006-10-2 20:13:55 |
|
| 2 | Adding Two-Digit Numbers with Paper and Pen... 1026 | 2006-10-2 20:25:19 |
|
| 3 | Estimating a sum by rounding 1259 | 2006-10-4 13:23:49 |
|
| 4 | Front End Estimation of Sums 2774 | 2006-10-4 13:32:06 |
|
| 5 | Add three 2-digit Numbers 1080 | 2006-10-17 16:02:05 |
|
| 6 | Adding Three Digit Numbers 851 | 2006-10-17 16:07:35 |
|
| 7 | Adding Numbers Arranged Vertically 847 | 2006-11-4 20:39:54 |
|
| 8 | Changing Hours and Minutes to Minutes 907 | 2006-11-14 22:08:49 |
|
| 9 | Addition of Hours and Minutes 1504 | 2006-11-18 22:12:00 |
|
| 10 | Add hours 838 | 2006-11-18 22:40:56 |
|
| 11 | Add half hours 380 | 2006-11-18 22:42:53 |
|
| 12 | Place Values by Adding 459 | 2006-11-19 13:05:38 |
|
| 13 | Addition equations with 2 digit numbers 423 | 2006-11-24 19:05:52 |
|
| 14 | Addition equations with 3 digit numbers 415 | 2006-11-24 19:06:54 |
|
| 15 | Adding Fractions with the same Denominator 456 | 2006-11-27 19:37:05 |
|
| 16 | Subtraction Equations - Two Digit Numbers 603 | 2006-12-14 22:44:16 |
|
| 17 | Estimating a difference by rounding 646 | 2006-12-15 22:43:23 |
|
| 18 | Subtracting Two-Digit Numbers with a calcul... 427 | 2006-12-16 22:23:57 |
|
| 19 | Subtraction of Three Digit Numbers 407 | 2007-1-11 20:01:55 |
|
| 20 | Subtracting Two-Digit Numbers with a calcul... 338 | 2006-12-16 22:23:57 |
|
