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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Wednesday November 11 2026
02:36:26 PM | Wednesday November 11 2026
02:36:26 PMFlip Answers |
| 1) | 392 * 408 = | | 1) 400 * 400 - 8 * 8 = 159936 |
| 2) | 210 * 190 = | | 2) 200 * 200 - 10 * 10 = 39900 |
| 3) | 394 * 406 = | | 3) 400 * 400 - 6 * 6 = 159964 |
| 4) | 208 * 192 = | | 4) 200 * 200 - 8 * 8 = 39936 |
| 5) | 196 * 204 = | | 5) 200 * 200 - 4 * 4 = 39984 |
| 6) | 208 * 192 = | | 6) 200 * 200 - 8 * 8 = 39936 |
| 7) | 194 * 206 = | | 7) 200 * 200 - 6 * 6 = 39964 |
| 8) | 192 * 208 = | | 8) 200 * 200 - 8 * 8 = 39936 |
| 9) | 308 * 292 = | | 9) 300 * 300 - 8 * 8 = 89936 |
| 10) | 209 * 191 = | | 10) 200 * 200 - 9 * 9 = 39919 |
| 11) | 73 * 237 - 37 * 73 = | | 11) ( 237 - 37) * 73 = 14600 |
| 12) | 93 * 147 + 53 * 93 = | | 12) ( 147 + 53) * 93 = 18600 |
| 13) | 39 * 79 + 79 * 61 = | | 13) ( 61 + 39) * 79 = 7900 |
| 14) | 165 * 92 - 92 * 65 = | | 14) ( 165 - 65) * 92 = 9200 |
| 15) | 63 * 48 + 137 * 48 = | | 15) ( 137 + 63) * 48 = 9600 |
| 16) | 239 * 38 - 38 * 39 = | | 16) ( 239 - 39) * 38 = 7600 |
| 17) | 48 * 32 + 32 * 52 = | | 17) ( 52 + 48) * 32 = 3200 |
| 18) | 143 * 84 + 57 * 84 = | | 18) ( 143 + 57) * 84 = 16800 |
| 19) | 24 * 73 + 24 * 127 = | | 19) ( 127 + 73) * 24 = 4800 |
| 20) | 62 * 262 - 62 * 62 = | | 20) ( 262 - 62) * 62 = 12400 |
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Score: ______________ | |
