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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Monday June 01 2026
03:02:52 PM | Monday June 01 2026
03:02:52 PMFlip Answers |
| 1) | 397 * 403 = | | 1) 400 * 400 - 3 * 3 = 159991 |
| 2) | 102 * 98 = | | 2) 100 * 100 - 2 * 2 = 9996 |
| 3) | 296 * 304 = | | 3) 300 * 300 - 4 * 4 = 89984 |
| 4) | 405 * 395 = | | 4) 400 * 400 - 5 * 5 = 159975 |
| 5) | 106 * 94 = | | 5) 100 * 100 - 6 * 6 = 9964 |
| 6) | 307 * 293 = | | 6) 300 * 300 - 7 * 7 = 89951 |
| 7) | 199 * 201 = | | 7) 200 * 200 - 1 * 1 = 39999 |
| 8) | 404 * 396 = | | 8) 400 * 400 - 4 * 4 = 159984 |
| 9) | 404 * 396 = | | 9) 400 * 400 - 4 * 4 = 159984 |
| 10) | 302 * 298 = | | 10) 300 * 300 - 2 * 2 = 89996 |
| 11) | 70 * 69 + 69 * 30 = | | 11) ( 30 + 70) * 69 = 6900 |
| 12) | 48 * 241 - 48 * 41 = | | 12) ( 241 - 41) * 48 = 9600 |
| 13) | 80 * 154 - 80 * 54 = | | 13) ( 154 - 54) * 80 = 8000 |
| 14) | 61 * 89 + 89 * 39 = | | 14) ( 61 + 39) * 89 = 8900 |
| 15) | 24 * 174 - 74 * 24 = | | 15) ( 174 - 74) * 24 = 2400 |
| 16) | 259 * 49 - 49 * 59 = | | 16) ( 259 - 59) * 49 = 9800 |
| 17) | 154 * 79 - 54 * 79 = | | 17) ( 154 - 54) * 79 = 7900 |
| 18) | 253 * 34 - 53 * 34 = | | 18) ( 253 - 53) * 34 = 6800 |
| 19) | 81 * 74 + 81 * 126 = | | 19) ( 126 + 74) * 81 = 16200 |
| 20) | 141 * 77 - 77 * 41 = | | 20) ( 141 - 41) * 77 = 7700 |
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Score: ______________ | |
