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 30 2026
02:33:52 AM | Thursday July 30 2026
02:33:52 AMFlip Answers |
| 1) | 308 * 292 = | | 1) 300 * 300 - 8 * 8 = 89936 |
| 2) | 291 * 309 = | | 2) 300 * 300 - 9 * 9 = 89919 |
| 3) | 307 * 293 = | | 3) 300 * 300 - 7 * 7 = 89951 |
| 4) | 97 * 103 = | | 4) 100 * 100 - 3 * 3 = 9991 |
| 5) | 295 * 305 = | | 5) 300 * 300 - 5 * 5 = 89975 |
| 6) | 209 * 191 = | | 6) 200 * 200 - 9 * 9 = 39919 |
| 7) | 301 * 299 = | | 7) 300 * 300 - 1 * 1 = 89999 |
| 8) | 399 * 401 = | | 8) 400 * 400 - 1 * 1 = 159999 |
| 9) | 393 * 407 = | | 9) 400 * 400 - 7 * 7 = 159951 |
| 10) | 393 * 407 = | | 10) 400 * 400 - 7 * 7 = 159951 |
| 11) | 39 * 147 + 53 * 39 = | | 11) ( 147 + 53) * 39 = 7800 |
| 12) | 75 * 21 + 21 * 25 = | | 12) ( 25 + 75) * 21 = 2100 |
| 13) | 48 * 72 + 72 * 152 = | | 13) ( 152 + 48) * 72 = 14400 |
| 14) | 51 * 75 + 49 * 75 = | | 14) ( 51 + 49) * 75 = 7500 |
| 15) | 133 * 33 + 33 * 67 = | | 15) ( 133 + 67) * 33 = 6600 |
| 16) | 96 * 154 - 96 * 54 = | | 16) ( 154 - 54) * 96 = 9600 |
| 17) | 49 * 137 + 63 * 49 = | | 17) ( 137 + 63) * 49 = 9800 |
| 18) | 45 * 49 + 151 * 45 = | | 18) ( 151 + 49) * 45 = 9000 |
| 19) | 155 * 44 - 44 * 55 = | | 19) ( 155 - 55) * 44 = 4400 |
| 20) | 36 * 73 + 36 * 27 = | | 20) ( 27 + 73) * 36 = 3600 |
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Score: ______________ | |
