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 November 14 2026
05:20:20 PM | Saturday November 14 2026
05:20:20 PMFlip Answers |
| 1) | 94 * 106 = | | 1) 100 * 100 - 6 * 6 = 9964 |
| 2) | 109 * 91 = | | 2) 100 * 100 - 9 * 9 = 9919 |
| 3) | 297 * 303 = | | 3) 300 * 300 - 3 * 3 = 89991 |
| 4) | 191 * 209 = | | 4) 200 * 200 - 9 * 9 = 39919 |
| 5) | 407 * 393 = | | 5) 400 * 400 - 7 * 7 = 159951 |
| 6) | 190 * 210 = | | 6) 200 * 200 - 10 * 10 = 39900 |
| 7) | 310 * 290 = | | 7) 300 * 300 - 10 * 10 = 89900 |
| 8) | 305 * 295 = | | 8) 300 * 300 - 5 * 5 = 89975 |
| 9) | 308 * 292 = | | 9) 300 * 300 - 8 * 8 = 89936 |
| 10) | 206 * 194 = | | 10) 200 * 200 - 6 * 6 = 39964 |
| 11) | 34 * 143 - 43 * 34 = | | 11) ( 143 - 43) * 34 = 3400 |
| 12) | 257 * 34 - 57 * 34 = | | 12) ( 257 - 57) * 34 = 6800 |
| 13) | 147 * 33 - 47 * 33 = | | 13) ( 147 - 47) * 33 = 3300 |
| 14) | 144 * 49 - 44 * 49 = | | 14) ( 144 - 44) * 49 = 4900 |
| 15) | 84 * 136 + 64 * 84 = | | 15) ( 136 + 64) * 84 = 16800 |
| 16) | 146 * 54 + 54 * 54 = | | 16) ( 146 + 54) * 54 = 10800 |
| 17) | 46 * 73 + 73 * 154 = | | 17) ( 154 + 46) * 73 = 14600 |
| 18) | 58 * 90 + 42 * 90 = | | 18) ( 42 + 58) * 90 = 9000 |
| 19) | 265 * 72 - 65 * 72 = | | 19) ( 265 - 65) * 72 = 14400 |
| 20) | 44 * 163 - 63 * 44 = | | 20) ( 163 - 63) * 44 = 4400 |
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Score: ______________ | |
