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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Thursday July 09 2026
04:02:02 AM | Thursday July 09 2026
04:02:02 AMFlip Answers |
| 1) | 199 * 201 = | | 1) 200 * 200 - 1 * 1 = 39999 |
| 2) | 98 * 102 = | | 2) 100 * 100 - 2 * 2 = 9996 |
| 3) | 103 * 97 = | | 3) 100 * 100 - 3 * 3 = 9991 |
| 4) | 302 * 298 = | | 4) 300 * 300 - 2 * 2 = 89996 |
| 5) | 396 * 404 = | | 5) 400 * 400 - 4 * 4 = 159984 |
| 6) | 194 * 206 = | | 6) 200 * 200 - 6 * 6 = 39964 |
| 7) | 209 * 191 = | | 7) 200 * 200 - 9 * 9 = 39919 |
| 8) | 207 * 193 = | | 8) 200 * 200 - 7 * 7 = 39951 |
| 9) | 397 * 403 = | | 9) 400 * 400 - 3 * 3 = 159991 |
| 10) | 301 * 299 = | | 10) 300 * 300 - 1 * 1 = 89999 |
| 11) | 141 * 61 - 41 * 61 = | | 11) ( 141 - 41) * 61 = 6100 |
| 12) | 69 * 154 + 69 * 46 = | | 12) ( 154 + 46) * 69 = 13800 |
| 13) | 168 * 97 - 68 * 97 = | | 13) ( 168 - 68) * 97 = 9700 |
| 14) | 93 * 273 - 73 * 93 = | | 14) ( 273 - 73) * 93 = 18600 |
| 15) | 40 * 82 + 160 * 82 = | | 15) ( 160 + 40) * 82 = 16400 |
| 16) | 238 * 21 - 38 * 21 = | | 16) ( 238 - 38) * 21 = 4200 |
| 17) | 82 * 261 - 82 * 61 = | | 17) ( 261 - 61) * 82 = 16400 |
| 18) | 39 * 259 - 39 * 59 = | | 18) ( 259 - 59) * 39 = 7800 |
| 19) | 65 * 138 - 65 * 38 = | | 19) ( 138 - 38) * 65 = 6500 |
| 20) | 32 * 262 - 62 * 32 = | | 20) ( 262 - 62) * 32 = 6400 |
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Score: ______________ | |
