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 May 04 2026
06:43:27 PM | Monday May 04 2026
06:43:27 PMFlip Answers |
| 1) | 296 * 304 = | | 1) 300 * 300 - 4 * 4 = 89984 |
| 2) | 408 * 392 = | | 2) 400 * 400 - 8 * 8 = 159936 |
| 3) | 310 * 290 = | | 3) 300 * 300 - 10 * 10 = 89900 |
| 4) | 398 * 402 = | | 4) 400 * 400 - 2 * 2 = 159996 |
| 5) | 398 * 402 = | | 5) 400 * 400 - 2 * 2 = 159996 |
| 6) | 401 * 399 = | | 6) 400 * 400 - 1 * 1 = 159999 |
| 7) | 399 * 401 = | | 7) 400 * 400 - 1 * 1 = 159999 |
| 8) | 101 * 99 = | | 8) 100 * 100 - 1 * 1 = 9999 |
| 9) | 293 * 307 = | | 9) 300 * 300 - 7 * 7 = 89951 |
| 10) | 107 * 93 = | | 10) 100 * 100 - 7 * 7 = 9951 |
| 11) | 22 * 252 - 22 * 52 = | | 11) ( 252 - 52) * 22 = 4400 |
| 12) | 156 * 25 - 25 * 56 = | | 12) ( 156 - 56) * 25 = 2500 |
| 13) | 59 * 70 + 141 * 70 = | | 13) ( 141 + 59) * 70 = 14000 |
| 14) | 141 * 75 + 59 * 75 = | | 14) ( 141 + 59) * 75 = 15000 |
| 15) | 22 * 55 + 22 * 145 = | | 15) ( 145 + 55) * 22 = 4400 |
| 16) | 70 * 271 - 71 * 70 = | | 16) ( 271 - 71) * 70 = 14000 |
| 17) | 173 * 80 - 73 * 80 = | | 17) ( 173 - 73) * 80 = 8000 |
| 18) | 245 * 44 - 45 * 44 = | | 18) ( 245 - 45) * 44 = 8800 |
| 19) | 62 * 171 - 62 * 71 = | | 19) ( 171 - 71) * 62 = 6200 |
| 20) | 66 * 40 + 40 * 34 = | | 20) ( 34 + 66) * 40 = 4000 |
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Score: ______________ | |
