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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Wednesday April 15 2026
01:23:41 PM | Wednesday April 15 2026
01:23:41 PMFlip Answers |
| 1) | 93 * 107 = | | 1) 100 * 100 - 7 * 7 = 9951 |
| 2) | 199 * 201 = | | 2) 200 * 200 - 1 * 1 = 39999 |
| 3) | 193 * 207 = | | 3) 200 * 200 - 7 * 7 = 39951 |
| 4) | 403 * 397 = | | 4) 400 * 400 - 3 * 3 = 159991 |
| 5) | 395 * 405 = | | 5) 400 * 400 - 5 * 5 = 159975 |
| 6) | 302 * 298 = | | 6) 300 * 300 - 2 * 2 = 89996 |
| 7) | 301 * 299 = | | 7) 300 * 300 - 1 * 1 = 89999 |
| 8) | 291 * 309 = | | 8) 300 * 300 - 9 * 9 = 89919 |
| 9) | 305 * 295 = | | 9) 300 * 300 - 5 * 5 = 89975 |
| 10) | 291 * 309 = | | 10) 300 * 300 - 9 * 9 = 89919 |
| 11) | 141 * 52 + 52 * 59 = | | 11) ( 141 + 59) * 52 = 10400 |
| 12) | 141 * 86 - 86 * 41 = | | 12) ( 141 - 41) * 86 = 8600 |
| 13) | 26 * 34 + 74 * 34 = | | 13) ( 26 + 74) * 34 = 3400 |
| 14) | 158 * 41 - 41 * 58 = | | 14) ( 158 - 58) * 41 = 4100 |
| 15) | 264 * 23 - 23 * 64 = | | 15) ( 264 - 64) * 23 = 4600 |
| 16) | 51 * 59 + 41 * 51 = | | 16) ( 59 + 41) * 51 = 5100 |
| 17) | 34 * 74 + 34 * 26 = | | 17) ( 26 + 74) * 34 = 3400 |
| 18) | 61 * 32 + 32 * 139 = | | 18) ( 139 + 61) * 32 = 6400 |
| 19) | 21 * 275 - 75 * 21 = | | 19) ( 275 - 75) * 21 = 4200 |
| 20) | 165 * 96 - 96 * 65 = | | 20) ( 165 - 65) * 96 = 9600 |
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Score: ______________ | |
