Math Main Page => Exercises - Math III
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Goal: to practice how to make use of distributive property on special numbers, like (A + B) * (A - B) = A*A - B*B, A*C +B*C = (A + B ) *C, A*C - B*C = (A-B) * C
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Monday June 08 2026
10:58:05 PM | Monday June 08 2026
10:58:05 PMFlip Answers |
| 1) | 192 * 208 = | | 1) 200 * 200 - 8 * 8 = 39936 |
| 2) | 193 * 207 = | | 2) 200 * 200 - 7 * 7 = 39951 |
| 3) | 90 * 110 = | | 3) 100 * 100 - 10 * 10 = 9900 |
| 4) | 307 * 293 = | | 4) 300 * 300 - 7 * 7 = 89951 |
| 5) | 190 * 210 = | | 5) 200 * 200 - 10 * 10 = 39900 |
| 6) | 106 * 94 = | | 6) 100 * 100 - 6 * 6 = 9964 |
| 7) | 306 * 294 = | | 7) 300 * 300 - 6 * 6 = 89964 |
| 8) | 190 * 210 = | | 8) 200 * 200 - 10 * 10 = 39900 |
| 9) | 90 * 110 = | | 9) 100 * 100 - 10 * 10 = 9900 |
| 10) | 297 * 303 = | | 10) 300 * 300 - 3 * 3 = 89991 |
| 11) | 81 * 244 - 44 * 81 = | | 11) ( 244 - 44) * 81 = 16200 |
| 12) | 56 * 125 + 75 * 56 = | | 12) ( 125 + 75) * 56 = 11200 |
| 13) | 149 * 89 - 89 * 49 = | | 13) ( 149 - 49) * 89 = 8900 |
| 14) | 29 * 164 + 29 * 36 = | | 14) ( 164 + 36) * 29 = 5800 |
| 15) | 65 * 268 - 65 * 68 = | | 15) ( 268 - 68) * 65 = 13000 |
| 16) | 52 * 149 - 52 * 49 = | | 16) ( 149 - 49) * 52 = 5200 |
| 17) | 74 * 35 + 35 * 126 = | | 17) ( 126 + 74) * 35 = 7000 |
| 18) | 43 * 30 + 70 * 43 = | | 18) ( 30 + 70) * 43 = 4300 |
| 19) | 57 * 169 - 57 * 69 = | | 19) ( 169 - 69) * 57 = 5700 |
| 20) | 88 * 143 - 43 * 88 = | | 20) ( 143 - 43) * 88 = 8800 |
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Score: ______________ | |
