| No. |
Title | Add time |
| 1 |  Inverse relationship of Addition and Subtra... 2549 | 2006-10-24 22:25:28 |
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| 2 | The Four Basic Operations 1407 | 2006-11-19 13:07:11 |
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| 3 | Subtract Objects I 524 | 2006-11-28 19:06:12 |
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| 4 | Subtract Objects II 512 | 2006-11-28 19:15:29 |
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| 5 | Subtracting Numbers I 558 | 2006-11-30 18:23:24 |
|
| 6 | Subtracting Numbers II 529 | 2006-11-30 18:24:12 |
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| 7 | Subtracting Using Words 532 | 2006-12-6 18:33:38 |
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| 8 | Subtraction Facts 0, 1 and 2 518 | 2006-12-6 18:37:04 |
|
| 9 | Subtraction Facts 3 and 4 472 | 2006-12-7 17:28:35 |
|
| 10 | Subtraction Facts 5 and 6 492 | 2006-12-7 17:31:08 |
|
| 11 | Subtraction Facts 7 and 8 486 | 2006-12-8 21:14:53 |
|
| 12 | Subtraction Facts 9 and 10 469 | 2006-12-9 18:30:31 |
|
| 13 | Subtraction Facts All for 0 through 10 536 | 2006-12-9 18:31:19 |
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| 14 | Subtraction Equations - One Digit Numbers 519 | 2006-12-14 22:40:05 |
|
| 15 | Subtracting Tens 544 | 2006-12-14 22:40:58 |
|
| 16 | Subtracting Two Digit Numbers without Renam... 1240 | 2006-12-14 22:43:19 |
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| 17 | Subtraction Equations - Two Digit Numbers 583 | 2006-12-14 22:44:16 |
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| 18 | Subtracting Hundreds 1098 | 2006-12-14 22:45:05 |
|
| 19 | Estimating a difference by rounding 622 | 2006-12-15 22:43:23 |
|
| 20 | Mentally Subtracting Two-Digit Numbers 1068 | 2006-12-15 22:44:53 |
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