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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Friday January 16 2026
03:56:15 AM | Friday January 16 2026
03:56:15 AMFlip Answers |
| 1) | 190 * 210 = | | 1) 200 * 200 - 10 * 10 = 39900 |
| 2) | 90 * 110 = | | 2) 100 * 100 - 10 * 10 = 9900 |
| 3) | 101 * 99 = | | 3) 100 * 100 - 1 * 1 = 9999 |
| 4) | 196 * 204 = | | 4) 200 * 200 - 4 * 4 = 39984 |
| 5) | 306 * 294 = | | 5) 300 * 300 - 6 * 6 = 89964 |
| 6) | 203 * 197 = | | 6) 200 * 200 - 3 * 3 = 39991 |
| 7) | 93 * 107 = | | 7) 100 * 100 - 7 * 7 = 9951 |
| 8) | 297 * 303 = | | 8) 300 * 300 - 3 * 3 = 89991 |
| 9) | 191 * 209 = | | 9) 200 * 200 - 9 * 9 = 39919 |
| 10) | 397 * 403 = | | 10) 400 * 400 - 3 * 3 = 159991 |
| 11) | 37 * 58 + 37 * 42 = | | 11) ( 42 + 58) * 37 = 3700 |
| 12) | 82 * 265 - 82 * 65 = | | 12) ( 265 - 65) * 82 = 16400 |
| 13) | 157 * 90 + 90 * 43 = | | 13) ( 157 + 43) * 90 = 18000 |
| 14) | 36 * 157 - 36 * 57 = | | 14) ( 157 - 57) * 36 = 3600 |
| 15) | 86 * 55 + 86 * 145 = | | 15) ( 145 + 55) * 86 = 17200 |
| 16) | 82 * 59 + 82 * 41 = | | 16) ( 59 + 41) * 82 = 8200 |
| 17) | 62 * 52 + 38 * 52 = | | 17) ( 38 + 62) * 52 = 5200 |
| 18) | 50 * 54 + 146 * 50 = | | 18) ( 146 + 54) * 50 = 10000 |
| 19) | 94 * 141 + 94 * 59 = | | 19) ( 141 + 59) * 94 = 18800 |
| 20) | 92 * 164 - 92 * 64 = | | 20) ( 164 - 64) * 92 = 9200 |
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Score: ______________ | |
