| No. |
Title | Add time |
| 1 |  Basic Addition--Add Objects I 5999 | 2007-02-04 15:43:37 |
|
| 2 | Basic Addition--Add Objects II 4384 | 2007-02-05 17:12:03 |
|
| 3 | Basic Addition--Adding Numbers I 4182 | 2007-02-05 18:12:23 |
|
| 4 | Basic Addition--Adding Numbers II 3983 | 2007-02-05 18:38:30 |
|
| 5 | Basic Addition--Adding Using Words 4422 | 2007-02-05 18:52:02 |
|
| 6 | Addition Facts for 0, 1 and 2 4048 | 2007-02-05 21:00:04 |
|
| 7 | Addition Facts for 3 and 4 4103 | 2007-02-05 21:07:11 |
|
| 8 | Addition Facts for 5 and 6 4098 | 2007-02-05 21:14:07 |
|
| 9 | Addition Facts for 7 and 8 4084 | 2007-02-05 22:58:57 |
|
| 10 | Addition Facts for 9 and 10 4176 | 2007-02-05 23:06:11 |
|
| 11 | Addition Facts for All to 9 + 9 2952 | 2007-02-05 23:15:08 |
|
| 12 | Adding Tens 3142 | 2006-10-02 20:05:47 |
|
| 13 | Adding Two Digit Numbers Without Renaming 5581 | 2006-10-02 20:08:56 |
|
| 14 | Adding Three One-Digit Numbers 3238 | 2006-10-02 20:10:15 |
|
| 15 | Adding Hundreds 4634 | 2006-10-02 20:12:54 |
|
| 16 | Mentally Adding Two-Digit Numbers 4415 | 2006-10-02 20:13:55 |
|
| 17 | Adding Two-Digit Numbers with Paper and Pen... 4062 | 2006-10-02 20:25:19 |
|
| 18 | Estimating a sum by rounding 4183 | 2006-10-04 13:23:49 |
|
| 19 | Front End Estimation of Sums 7889 | 2006-10-04 13:32:06 |
|
| 20 | Add three 2-digit Numbers 4110 | 2006-10-17 16:02:05 |
|
