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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Saturday July 04 2026
11:24:30 PM | Saturday July 04 2026
11:24:30 PMFlip Answers |
| 1) | 394 * 406 = | | 1) 400 * 400 - 6 * 6 = 159964 |
| 2) | 91 * 109 = | | 2) 100 * 100 - 9 * 9 = 9919 |
| 3) | 292 * 308 = | | 3) 300 * 300 - 8 * 8 = 89936 |
| 4) | 209 * 191 = | | 4) 200 * 200 - 9 * 9 = 39919 |
| 5) | 93 * 107 = | | 5) 100 * 100 - 7 * 7 = 9951 |
| 6) | 308 * 292 = | | 6) 300 * 300 - 8 * 8 = 89936 |
| 7) | 103 * 97 = | | 7) 100 * 100 - 3 * 3 = 9991 |
| 8) | 205 * 195 = | | 8) 200 * 200 - 5 * 5 = 39975 |
| 9) | 92 * 108 = | | 9) 100 * 100 - 8 * 8 = 9936 |
| 10) | 94 * 106 = | | 10) 100 * 100 - 6 * 6 = 9964 |
| 11) | 91 * 136 - 36 * 91 = | | 11) ( 136 - 36) * 91 = 9100 |
| 12) | 30 * 37 + 63 * 30 = | | 12) ( 63 + 37) * 30 = 3000 |
| 13) | 29 * 39 + 29 * 61 = | | 13) ( 61 + 39) * 29 = 2900 |
| 14) | 70 * 32 + 30 * 32 = | | 14) ( 30 + 70) * 32 = 3200 |
| 15) | 59 * 171 - 71 * 59 = | | 15) ( 171 - 71) * 59 = 5900 |
| 16) | 90 * 144 - 90 * 44 = | | 16) ( 144 - 44) * 90 = 9000 |
| 17) | 84 * 44 + 84 * 56 = | | 17) ( 56 + 44) * 84 = 8400 |
| 18) | 43 * 58 + 58 * 157 = | | 18) ( 157 + 43) * 58 = 11600 |
| 19) | 44 * 33 + 67 * 44 = | | 19) ( 33 + 67) * 44 = 4400 |
| 20) | 88 * 162 + 88 * 38 = | | 20) ( 162 + 38) * 88 = 17600 |
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Score: ______________ | |
