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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Sunday February 22 2026
12:03:02 PM | Sunday February 22 2026
12:03:02 PMFlip Answers |
| 1) | 204 * 196 = | | 1) 200 * 200 - 4 * 4 = 39984 |
| 2) | 305 * 295 = | | 2) 300 * 300 - 5 * 5 = 89975 |
| 3) | 94 * 106 = | | 3) 100 * 100 - 6 * 6 = 9964 |
| 4) | 107 * 93 = | | 4) 100 * 100 - 7 * 7 = 9951 |
| 5) | 97 * 103 = | | 5) 100 * 100 - 3 * 3 = 9991 |
| 6) | 99 * 101 = | | 6) 100 * 100 - 1 * 1 = 9999 |
| 7) | 102 * 98 = | | 7) 100 * 100 - 2 * 2 = 9996 |
| 8) | 294 * 306 = | | 8) 300 * 300 - 6 * 6 = 89964 |
| 9) | 206 * 194 = | | 9) 200 * 200 - 6 * 6 = 39964 |
| 10) | 204 * 196 = | | 10) 200 * 200 - 4 * 4 = 39984 |
| 11) | 61 * 25 + 25 * 139 = | | 11) ( 139 + 61) * 25 = 5000 |
| 12) | 82 * 171 - 82 * 71 = | | 12) ( 171 - 71) * 82 = 8200 |
| 13) | 28 * 275 - 28 * 75 = | | 13) ( 275 - 75) * 28 = 5600 |
| 14) | 87 * 174 - 74 * 87 = | | 14) ( 174 - 74) * 87 = 8700 |
| 15) | 170 * 82 - 82 * 70 = | | 15) ( 170 - 70) * 82 = 8200 |
| 16) | 27 * 65 + 65 * 73 = | | 16) ( 27 + 73) * 65 = 6500 |
| 17) | 49 * 30 + 151 * 30 = | | 17) ( 151 + 49) * 30 = 6000 |
| 18) | 33 * 45 + 45 * 67 = | | 18) ( 33 + 67) * 45 = 4500 |
| 19) | 243 * 52 - 52 * 43 = | | 19) ( 243 - 43) * 52 = 10400 |
| 20) | 88 * 164 - 88 * 64 = | | 20) ( 164 - 64) * 88 = 8800 |
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Score: ______________ | |
