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 March 20 2026
08:41:48 AM | Friday March 20 2026
08:41:48 AMFlip Answers |
| 1) | 96 * 104 = | | 1) 100 * 100 - 4 * 4 = 9984 |
| 2) | 303 * 297 = | | 2) 300 * 300 - 3 * 3 = 89991 |
| 3) | 297 * 303 = | | 3) 300 * 300 - 3 * 3 = 89991 |
| 4) | 96 * 104 = | | 4) 100 * 100 - 4 * 4 = 9984 |
| 5) | 197 * 203 = | | 5) 200 * 200 - 3 * 3 = 39991 |
| 6) | 294 * 306 = | | 6) 300 * 300 - 6 * 6 = 89964 |
| 7) | 292 * 308 = | | 7) 300 * 300 - 8 * 8 = 89936 |
| 8) | 390 * 410 = | | 8) 400 * 400 - 10 * 10 = 159900 |
| 9) | 198 * 202 = | | 9) 200 * 200 - 2 * 2 = 39996 |
| 10) | 393 * 407 = | | 10) 400 * 400 - 7 * 7 = 159951 |
| 11) | 83 * 57 + 83 * 43 = | | 11) ( 57 + 43) * 83 = 8300 |
| 12) | 53 * 87 + 87 * 47 = | | 12) ( 53 + 47) * 87 = 8700 |
| 13) | 63 * 30 + 70 * 63 = | | 13) ( 30 + 70) * 63 = 6300 |
| 14) | 254 * 62 - 62 * 54 = | | 14) ( 254 - 54) * 62 = 12400 |
| 15) | 164 * 30 + 30 * 36 = | | 15) ( 164 + 36) * 30 = 6000 |
| 16) | 148 * 72 - 48 * 72 = | | 16) ( 148 - 48) * 72 = 7200 |
| 17) | 60 * 21 + 40 * 21 = | | 17) ( 40 + 60) * 21 = 2100 |
| 18) | 71 * 56 + 129 * 56 = | | 18) ( 129 + 71) * 56 = 11200 |
| 19) | 54 * 41 + 54 * 159 = | | 19) ( 159 + 41) * 54 = 10800 |
| 20) | 54 * 245 - 54 * 45 = | | 20) ( 245 - 45) * 54 = 10800 |
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Score: ______________ | |
