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 June 18 2026
05:41:00 AM | Thursday June 18 2026
05:41:00 AMFlip Answers |
| 1) | 401 * 399 = | | 1) 400 * 400 - 1 * 1 = 159999 |
| 2) | 204 * 196 = | | 2) 200 * 200 - 4 * 4 = 39984 |
| 3) | 107 * 93 = | | 3) 100 * 100 - 7 * 7 = 9951 |
| 4) | 404 * 396 = | | 4) 400 * 400 - 4 * 4 = 159984 |
| 5) | 209 * 191 = | | 5) 200 * 200 - 9 * 9 = 39919 |
| 6) | 191 * 209 = | | 6) 200 * 200 - 9 * 9 = 39919 |
| 7) | 93 * 107 = | | 7) 100 * 100 - 7 * 7 = 9951 |
| 8) | 308 * 292 = | | 8) 300 * 300 - 8 * 8 = 89936 |
| 9) | 205 * 195 = | | 9) 200 * 200 - 5 * 5 = 39975 |
| 10) | 197 * 203 = | | 10) 200 * 200 - 3 * 3 = 39991 |
| 11) | 34 * 65 + 135 * 34 = | | 11) ( 135 + 65) * 34 = 6800 |
| 12) | 151 * 25 - 51 * 25 = | | 12) ( 151 - 51) * 25 = 2500 |
| 13) | 78 * 243 - 78 * 43 = | | 13) ( 243 - 43) * 78 = 15600 |
| 14) | 82 * 43 + 157 * 82 = | | 14) ( 157 + 43) * 82 = 16400 |
| 15) | 242 * 37 - 42 * 37 = | | 15) ( 242 - 42) * 37 = 7400 |
| 16) | 51 * 46 + 51 * 54 = | | 16) ( 46 + 54) * 51 = 5100 |
| 17) | 38 * 260 - 60 * 38 = | | 17) ( 260 - 60) * 38 = 7600 |
| 18) | 25 * 145 + 55 * 25 = | | 18) ( 145 + 55) * 25 = 5000 |
| 19) | 148 * 79 + 79 * 52 = | | 19) ( 148 + 52) * 79 = 15800 |
| 20) | 148 * 76 + 76 * 52 = | | 20) ( 148 + 52) * 76 = 15200 |
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Score: ______________ | |
