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 18 2026
12:01:40 PM | Monday May 18 2026
12:01:40 PMFlip Answers |
| 1) | 290 * 310 = | | 1) 300 * 300 - 10 * 10 = 89900 |
| 2) | 193 * 207 = | | 2) 200 * 200 - 7 * 7 = 39951 |
| 3) | 94 * 106 = | | 3) 100 * 100 - 6 * 6 = 9964 |
| 4) | 198 * 202 = | | 4) 200 * 200 - 2 * 2 = 39996 |
| 5) | 210 * 190 = | | 5) 200 * 200 - 10 * 10 = 39900 |
| 6) | 204 * 196 = | | 6) 200 * 200 - 4 * 4 = 39984 |
| 7) | 204 * 196 = | | 7) 200 * 200 - 4 * 4 = 39984 |
| 8) | 396 * 404 = | | 8) 400 * 400 - 4 * 4 = 159984 |
| 9) | 295 * 305 = | | 9) 300 * 300 - 5 * 5 = 89975 |
| 10) | 195 * 205 = | | 10) 200 * 200 - 5 * 5 = 39975 |
| 11) | 36 * 59 + 36 * 141 = | | 11) ( 141 + 59) * 36 = 7200 |
| 12) | 261 * 62 - 61 * 62 = | | 12) ( 261 - 61) * 62 = 12400 |
| 13) | 251 * 86 - 51 * 86 = | | 13) ( 251 - 51) * 86 = 17200 |
| 14) | 58 * 136 - 36 * 58 = | | 14) ( 136 - 36) * 58 = 5800 |
| 15) | 93 * 147 + 93 * 53 = | | 15) ( 147 + 53) * 93 = 18600 |
| 16) | 48 * 171 - 71 * 48 = | | 16) ( 171 - 71) * 48 = 4800 |
| 17) | 174 * 77 - 77 * 74 = | | 17) ( 174 - 74) * 77 = 7700 |
| 18) | 260 * 29 - 29 * 60 = | | 18) ( 260 - 60) * 29 = 5800 |
| 19) | 76 * 158 + 76 * 42 = | | 19) ( 158 + 42) * 76 = 15200 |
| 20) | 130 * 86 + 70 * 86 = | | 20) ( 130 + 70) * 86 = 17200 |
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Score: ______________ | |
