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 May 12 2026
08:43:17 AM | Tuesday May 12 2026
08:43:17 AMFlip Answers |
| 1) | 294 * 306 = | | 1) 300 * 300 - 6 * 6 = 89964 |
| 2) | 308 * 292 = | | 2) 300 * 300 - 8 * 8 = 89936 |
| 3) | 90 * 110 = | | 3) 100 * 100 - 10 * 10 = 9900 |
| 4) | 396 * 404 = | | 4) 400 * 400 - 4 * 4 = 159984 |
| 5) | 90 * 110 = | | 5) 100 * 100 - 10 * 10 = 9900 |
| 6) | 194 * 206 = | | 6) 200 * 200 - 6 * 6 = 39964 |
| 7) | 407 * 393 = | | 7) 400 * 400 - 7 * 7 = 159951 |
| 8) | 104 * 96 = | | 8) 100 * 100 - 4 * 4 = 9984 |
| 9) | 305 * 295 = | | 9) 300 * 300 - 5 * 5 = 89975 |
| 10) | 190 * 210 = | | 10) 200 * 200 - 10 * 10 = 39900 |
| 11) | 51 * 134 + 51 * 66 = | | 11) ( 134 + 66) * 51 = 10200 |
| 12) | 160 * 78 - 78 * 60 = | | 12) ( 160 - 60) * 78 = 7800 |
| 13) | 27 * 21 + 21 * 73 = | | 13) ( 27 + 73) * 21 = 2100 |
| 14) | 76 * 270 - 76 * 70 = | | 14) ( 270 - 70) * 76 = 15200 |
| 15) | 69 * 49 + 51 * 69 = | | 15) ( 49 + 51) * 69 = 6900 |
| 16) | 40 * 162 + 40 * 38 = | | 16) ( 162 + 38) * 40 = 8000 |
| 17) | 25 * 65 + 25 * 35 = | | 17) ( 65 + 35) * 25 = 2500 |
| 18) | 48 * 96 + 152 * 96 = | | 18) ( 152 + 48) * 96 = 19200 |
| 19) | 246 * 72 - 72 * 46 = | | 19) ( 246 - 46) * 72 = 14400 |
| 20) | 74 * 273 - 73 * 74 = | | 20) ( 273 - 73) * 74 = 14800 |
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Score: ______________ | |
