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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Tuesday June 23 2026
08:56:04 AM | Tuesday June 23 2026
08:56:04 AMFlip Answers |
| 1) | 197 * 203 = | | 1) 200 * 200 - 3 * 3 = 39991 |
| 2) | 292 * 308 = | | 2) 300 * 300 - 8 * 8 = 89936 |
| 3) | 403 * 397 = | | 3) 400 * 400 - 3 * 3 = 159991 |
| 4) | 110 * 90 = | | 4) 100 * 100 - 10 * 10 = 9900 |
| 5) | 292 * 308 = | | 5) 300 * 300 - 8 * 8 = 89936 |
| 6) | 206 * 194 = | | 6) 200 * 200 - 6 * 6 = 39964 |
| 7) | 291 * 309 = | | 7) 300 * 300 - 9 * 9 = 89919 |
| 8) | 303 * 297 = | | 8) 300 * 300 - 3 * 3 = 89991 |
| 9) | 201 * 199 = | | 9) 200 * 200 - 1 * 1 = 39999 |
| 10) | 401 * 399 = | | 10) 400 * 400 - 1 * 1 = 159999 |
| 11) | 95 * 165 - 95 * 65 = | | 11) ( 165 - 65) * 95 = 9500 |
| 12) | 22 * 139 - 22 * 39 = | | 12) ( 139 - 39) * 22 = 2200 |
| 13) | 155 * 87 + 87 * 45 = | | 13) ( 155 + 45) * 87 = 17400 |
| 14) | 30 * 269 - 69 * 30 = | | 14) ( 269 - 69) * 30 = 6000 |
| 15) | 255 * 71 - 71 * 55 = | | 15) ( 255 - 55) * 71 = 14200 |
| 16) | 25 * 40 + 25 * 60 = | | 16) ( 40 + 60) * 25 = 2500 |
| 17) | 25 * 169 - 69 * 25 = | | 17) ( 169 - 69) * 25 = 2500 |
| 18) | 60 * 35 + 35 * 40 = | | 18) ( 60 + 40) * 35 = 3500 |
| 19) | 126 * 23 + 74 * 23 = | | 19) ( 126 + 74) * 23 = 4600 |
| 20) | 142 * 89 - 42 * 89 = | | 20) ( 142 - 42) * 89 = 8900 |
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Score: ______________ | |
