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 November 10 2026
01:39:47 PM | Tuesday November 10 2026
01:39:47 PMFlip Answers |
| 1) | 209 * 191 = | | 1) 200 * 200 - 9 * 9 = 39919 |
| 2) | 205 * 195 = | | 2) 200 * 200 - 5 * 5 = 39975 |
| 3) | 107 * 93 = | | 3) 100 * 100 - 7 * 7 = 9951 |
| 4) | 98 * 102 = | | 4) 100 * 100 - 2 * 2 = 9996 |
| 5) | 408 * 392 = | | 5) 400 * 400 - 8 * 8 = 159936 |
| 6) | 201 * 199 = | | 6) 200 * 200 - 1 * 1 = 39999 |
| 7) | 303 * 297 = | | 7) 300 * 300 - 3 * 3 = 89991 |
| 8) | 295 * 305 = | | 8) 300 * 300 - 5 * 5 = 89975 |
| 9) | 308 * 292 = | | 9) 300 * 300 - 8 * 8 = 89936 |
| 10) | 294 * 306 = | | 10) 300 * 300 - 6 * 6 = 89964 |
| 11) | 36 * 163 - 36 * 63 = | | 11) ( 163 - 63) * 36 = 3600 |
| 12) | 93 * 256 - 93 * 56 = | | 12) ( 256 - 56) * 93 = 18600 |
| 13) | 161 * 56 - 56 * 61 = | | 13) ( 161 - 61) * 56 = 5600 |
| 14) | 74 * 37 + 74 * 63 = | | 14) ( 63 + 37) * 74 = 7400 |
| 15) | 31 * 162 + 31 * 38 = | | 15) ( 162 + 38) * 31 = 6200 |
| 16) | 158 * 53 + 53 * 42 = | | 16) ( 158 + 42) * 53 = 10600 |
| 17) | 86 * 41 + 86 * 59 = | | 17) ( 41 + 59) * 86 = 8600 |
| 18) | 96 * 138 - 38 * 96 = | | 18) ( 138 - 38) * 96 = 9600 |
| 19) | 47 * 74 + 47 * 126 = | | 19) ( 126 + 74) * 47 = 9400 |
| 20) | 95 * 173 - 73 * 95 = | | 20) ( 173 - 73) * 95 = 9500 |
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Score: ______________ | |
