| No. |
Title | Add time |
| 1 |  Adding Fractions with the same Denominator 1768 | 2006-11-27 19:37:05 |
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| 2 | Adding Fractions with Different Denominators 3728 | 2006-11-27 19:42:31 |
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| 3 | Adding Mixed Numbers with the same Denomina... 3153 | 2006-11-27 19:49:01 |
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| 4 | Subtract Objects I 2160 | 2006-11-28 19:06:12 |
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| 5 | Subtract Objects II 2260 | 2006-11-28 19:15:29 |
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| 6 | Subtracting Numbers I 2289 | 2006-11-30 18:23:24 |
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| 7 | Subtracting Numbers II 2131 | 2006-11-30 18:24:12 |
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| 8 | Subtracting Using Words 2185 | 2006-12-06 18:33:38 |
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| 9 | Subtraction Facts 0, 1 and 2 2235 | 2006-12-06 18:37:04 |
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| 10 | Subtraction Facts 3 and 4 2113 | 2006-12-07 17:28:35 |
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| 11 | Subtraction Facts 5 and 6 2119 | 2006-12-07 17:31:08 |
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| 12 | Subtraction Facts 7 and 8 2078 | 2006-12-08 21:14:53 |
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| 13 | Subtraction Facts 9 and 10 2071 | 2006-12-09 18:30:31 |
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| 14 | Subtraction Facts All for 0 through 10 2719 | 2006-12-09 18:31:19 |
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| 15 | Subtraction Equations - One Digit Numbers 2159 | 2006-12-14 22:40:05 |
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| 16 | Subtracting Tens 2282 | 2006-12-14 22:40:58 |
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| 17 | Subtracting Two Digit Numbers without Renam... 4712 | 2006-12-14 22:43:19 |
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| 18 | Subtraction Equations - Two Digit Numbers 2290 | 2006-12-14 22:44:16 |
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| 19 | Subtracting Hundreds 3456 | 2006-12-14 22:45:05 |
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| 20 | Estimating a difference by rounding 2627 | 2006-12-15 22:43:23 |
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