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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Friday February 06 2026
09:34:06 AM | Friday February 06 2026
09:34:06 AMFlip Answers |
| 1) | 203 * 197 = | | 1) 200 * 200 - 3 * 3 = 39991 |
| 2) | 202 * 198 = | | 2) 200 * 200 - 2 * 2 = 39996 |
| 3) | 302 * 298 = | | 3) 300 * 300 - 2 * 2 = 89996 |
| 4) | 308 * 292 = | | 4) 300 * 300 - 8 * 8 = 89936 |
| 5) | 303 * 297 = | | 5) 300 * 300 - 3 * 3 = 89991 |
| 6) | 108 * 92 = | | 6) 100 * 100 - 8 * 8 = 9936 |
| 7) | 397 * 403 = | | 7) 400 * 400 - 3 * 3 = 159991 |
| 8) | 107 * 93 = | | 8) 100 * 100 - 7 * 7 = 9951 |
| 9) | 90 * 110 = | | 9) 100 * 100 - 10 * 10 = 9900 |
| 10) | 297 * 303 = | | 10) 300 * 300 - 3 * 3 = 89991 |
| 11) | 49 * 248 - 48 * 49 = | | 11) ( 248 - 48) * 49 = 9800 |
| 12) | 79 * 132 + 68 * 79 = | | 12) ( 132 + 68) * 79 = 15800 |
| 13) | 144 * 38 - 44 * 38 = | | 13) ( 144 - 44) * 38 = 3800 |
| 14) | 52 * 66 + 148 * 66 = | | 14) ( 148 + 52) * 66 = 13200 |
| 15) | 136 * 94 - 36 * 94 = | | 15) ( 136 - 36) * 94 = 9400 |
| 16) | 26 * 265 - 26 * 65 = | | 16) ( 265 - 65) * 26 = 5200 |
| 17) | 28 * 46 + 28 * 154 = | | 17) ( 154 + 46) * 28 = 5600 |
| 18) | 257 * 68 - 57 * 68 = | | 18) ( 257 - 57) * 68 = 13600 |
| 19) | 27 * 266 - 66 * 27 = | | 19) ( 266 - 66) * 27 = 5400 |
| 20) | 59 * 161 + 39 * 59 = | | 20) ( 161 + 39) * 59 = 11800 |
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Score: ______________ | |
