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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Sunday June 07 2026
05:58:12 PM | Sunday June 07 2026
05:58:12 PMFlip Answers |
| 1) | 305 * 295 = | | 1) 300 * 300 - 5 * 5 = 89975 |
| 2) | 392 * 408 = | | 2) 400 * 400 - 8 * 8 = 159936 |
| 3) | 309 * 291 = | | 3) 300 * 300 - 9 * 9 = 89919 |
| 4) | 193 * 207 = | | 4) 200 * 200 - 7 * 7 = 39951 |
| 5) | 192 * 208 = | | 5) 200 * 200 - 8 * 8 = 39936 |
| 6) | 307 * 293 = | | 6) 300 * 300 - 7 * 7 = 89951 |
| 7) | 93 * 107 = | | 7) 100 * 100 - 7 * 7 = 9951 |
| 8) | 203 * 197 = | | 8) 200 * 200 - 3 * 3 = 39991 |
| 9) | 202 * 198 = | | 9) 200 * 200 - 2 * 2 = 39996 |
| 10) | 408 * 392 = | | 10) 400 * 400 - 8 * 8 = 159936 |
| 11) | 142 * 74 + 58 * 74 = | | 11) ( 142 + 58) * 74 = 14800 |
| 12) | 159 * 24 - 59 * 24 = | | 12) ( 159 - 59) * 24 = 2400 |
| 13) | 43 * 137 - 37 * 43 = | | 13) ( 137 - 37) * 43 = 4300 |
| 14) | 74 * 57 + 74 * 43 = | | 14) ( 57 + 43) * 74 = 7400 |
| 15) | 96 * 150 - 96 * 50 = | | 15) ( 150 - 50) * 96 = 9600 |
| 16) | 44 * 244 - 44 * 44 = | | 16) ( 244 - 44) * 44 = 8800 |
| 17) | 45 * 87 + 87 * 55 = | | 17) ( 45 + 55) * 87 = 8700 |
| 18) | 65 * 248 - 48 * 65 = | | 18) ( 248 - 48) * 65 = 13000 |
| 19) | 37 * 161 - 37 * 61 = | | 19) ( 161 - 61) * 37 = 3700 |
| 20) | 158 * 80 - 80 * 58 = | | 20) ( 158 - 58) * 80 = 8000 |
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Score: ______________ | |
