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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Tuesday May 12 2026
08:42:48 PM | Tuesday May 12 2026
08:42:48 PMFlip Answers |
| 1) | 402 * 398 = | | 1) 400 * 400 - 2 * 2 = 159996 |
| 2) | 302 * 298 = | | 2) 300 * 300 - 2 * 2 = 89996 |
| 3) | 291 * 309 = | | 3) 300 * 300 - 9 * 9 = 89919 |
| 4) | 402 * 398 = | | 4) 400 * 400 - 2 * 2 = 159996 |
| 5) | 392 * 408 = | | 5) 400 * 400 - 8 * 8 = 159936 |
| 6) | 302 * 298 = | | 6) 300 * 300 - 2 * 2 = 89996 |
| 7) | 203 * 197 = | | 7) 200 * 200 - 3 * 3 = 39991 |
| 8) | 406 * 394 = | | 8) 400 * 400 - 6 * 6 = 159964 |
| 9) | 201 * 199 = | | 9) 200 * 200 - 1 * 1 = 39999 |
| 10) | 303 * 297 = | | 10) 300 * 300 - 3 * 3 = 89991 |
| 11) | 55 * 236 - 36 * 55 = | | 11) ( 236 - 36) * 55 = 11000 |
| 12) | 95 * 50 + 95 * 150 = | | 12) ( 150 + 50) * 95 = 19000 |
| 13) | 88 * 274 - 88 * 74 = | | 13) ( 274 - 74) * 88 = 17600 |
| 14) | 154 * 70 - 70 * 54 = | | 14) ( 154 - 54) * 70 = 7000 |
| 15) | 58 * 83 + 83 * 142 = | | 15) ( 142 + 58) * 83 = 16600 |
| 16) | 265 * 79 - 65 * 79 = | | 16) ( 265 - 65) * 79 = 15800 |
| 17) | 66 * 166 - 66 * 66 = | | 17) ( 166 - 66) * 66 = 6600 |
| 18) | 61 * 35 + 65 * 61 = | | 18) ( 35 + 65) * 61 = 6100 |
| 19) | 53 * 65 + 53 * 135 = | | 19) ( 135 + 65) * 53 = 10600 |
| 20) | 38 * 30 + 70 * 38 = | | 20) ( 30 + 70) * 38 = 3800 |
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Score: ______________ | |
