| No. |
Title | Add time |
| 1 |  Basic Addition--Add Objects I 5707 | 2007-02-04 15:43:37 |
|
| 2 | Basic Addition--Add Objects II 4084 | 2007-02-05 17:12:03 |
|
| 3 | Basic Addition--Adding Numbers I 3904 | 2007-02-05 18:12:23 |
|
| 4 | Basic Addition--Adding Numbers II 3673 | 2007-02-05 18:38:30 |
|
| 5 | Basic Addition--Adding Using Words 4124 | 2007-02-05 18:52:02 |
|
| 6 | Addition Facts for 0, 1 and 2 3727 | 2007-02-05 21:00:04 |
|
| 7 | Addition Facts for 3 and 4 3835 | 2007-02-05 21:07:11 |
|
| 8 | Addition Facts for 5 and 6 3811 | 2007-02-05 21:14:07 |
|
| 9 | Addition Facts for 7 and 8 3786 | 2007-02-05 22:58:57 |
|
| 10 | Addition Facts for 9 and 10 3863 | 2007-02-05 23:06:11 |
|
| 11 | Addition Facts for All to 9 + 9 2656 | 2007-02-05 23:15:08 |
|
| 12 | Adding Tens 2840 | 2006-10-02 20:05:47 |
|
| 13 | Adding Two Digit Numbers Without Renaming 5270 | 2006-10-02 20:08:56 |
|
| 14 | Adding Three One-Digit Numbers 2948 | 2006-10-02 20:10:15 |
|
| 15 | Adding Hundreds 4329 | 2006-10-02 20:12:54 |
|
| 16 | Mentally Adding Two-Digit Numbers 4096 | 2006-10-02 20:13:55 |
|
| 17 | Adding Two-Digit Numbers with Paper and Pen... 3752 | 2006-10-02 20:25:19 |
|
| 18 | Estimating a sum by rounding 3916 | 2006-10-04 13:23:49 |
|
| 19 | Front End Estimation of Sums 7616 | 2006-10-04 13:32:06 |
|
| 20 | Add three 2-digit Numbers 3799 | 2006-10-17 16:02:05 |
|
