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 September 08 2026
06:46:16 PM | Tuesday September 08 2026
06:46:16 PMFlip Answers |
| 1) | 195 * 205 = | | 1) 200 * 200 - 5 * 5 = 39975 |
| 2) | 110 * 90 = | | 2) 100 * 100 - 10 * 10 = 9900 |
| 3) | 194 * 206 = | | 3) 200 * 200 - 6 * 6 = 39964 |
| 4) | 294 * 306 = | | 4) 300 * 300 - 6 * 6 = 89964 |
| 5) | 203 * 197 = | | 5) 200 * 200 - 3 * 3 = 39991 |
| 6) | 408 * 392 = | | 6) 400 * 400 - 8 * 8 = 159936 |
| 7) | 203 * 197 = | | 7) 200 * 200 - 3 * 3 = 39991 |
| 8) | 409 * 391 = | | 8) 400 * 400 - 9 * 9 = 159919 |
| 9) | 97 * 103 = | | 9) 100 * 100 - 3 * 3 = 9991 |
| 10) | 302 * 298 = | | 10) 300 * 300 - 2 * 2 = 89996 |
| 11) | 63 * 141 - 63 * 41 = | | 11) ( 141 - 41) * 63 = 6300 |
| 12) | 149 * 43 + 51 * 43 = | | 12) ( 149 + 51) * 43 = 8600 |
| 13) | 250 * 54 - 50 * 54 = | | 13) ( 250 - 50) * 54 = 10800 |
| 14) | 56 * 163 + 56 * 37 = | | 14) ( 163 + 37) * 56 = 11200 |
| 15) | 93 * 254 - 54 * 93 = | | 15) ( 254 - 54) * 93 = 18600 |
| 16) | 28 * 164 - 28 * 64 = | | 16) ( 164 - 64) * 28 = 2800 |
| 17) | 242 * 83 - 83 * 42 = | | 17) ( 242 - 42) * 83 = 16600 |
| 18) | 58 * 49 + 58 * 51 = | | 18) ( 51 + 49) * 58 = 5800 |
| 19) | 58 * 174 - 58 * 74 = | | 19) ( 174 - 74) * 58 = 5800 |
| 20) | 37 * 86 + 86 * 63 = | | 20) ( 37 + 63) * 86 = 8600 |
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Score: ______________ | |
