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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Thursday October 22 2026
05:44:31 AM | Thursday October 22 2026
05:44:31 AMFlip Answers |
| 1) | 97 * 103 = | | 1) 100 * 100 - 3 * 3 = 9991 |
| 2) | 403 * 397 = | | 2) 400 * 400 - 3 * 3 = 159991 |
| 3) | 408 * 392 = | | 3) 400 * 400 - 8 * 8 = 159936 |
| 4) | 206 * 194 = | | 4) 200 * 200 - 6 * 6 = 39964 |
| 5) | 398 * 402 = | | 5) 400 * 400 - 2 * 2 = 159996 |
| 6) | 201 * 199 = | | 6) 200 * 200 - 1 * 1 = 39999 |
| 7) | 191 * 209 = | | 7) 200 * 200 - 9 * 9 = 39919 |
| 8) | 196 * 204 = | | 8) 200 * 200 - 4 * 4 = 39984 |
| 9) | 190 * 210 = | | 9) 200 * 200 - 10 * 10 = 39900 |
| 10) | 398 * 402 = | | 10) 400 * 400 - 2 * 2 = 159996 |
| 11) | 259 * 57 - 57 * 59 = | | 11) ( 259 - 59) * 57 = 11400 |
| 12) | 93 * 57 + 43 * 93 = | | 12) ( 43 + 57) * 93 = 9300 |
| 13) | 153 * 53 + 47 * 53 = | | 13) ( 153 + 47) * 53 = 10600 |
| 14) | 82 * 53 + 82 * 47 = | | 14) ( 53 + 47) * 82 = 8200 |
| 15) | 146 * 48 - 46 * 48 = | | 15) ( 146 - 46) * 48 = 4800 |
| 16) | 258 * 46 - 46 * 58 = | | 16) ( 258 - 58) * 46 = 9200 |
| 17) | 141 * 32 - 32 * 41 = | | 17) ( 141 - 41) * 32 = 3200 |
| 18) | 48 * 160 + 40 * 48 = | | 18) ( 160 + 40) * 48 = 9600 |
| 19) | 67 * 258 - 67 * 58 = | | 19) ( 258 - 58) * 67 = 13400 |
| 20) | 253 * 28 - 28 * 53 = | | 20) ( 253 - 53) * 28 = 5600 |
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Score: ______________ | |
