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 April 07 2026
03:17:31 PM | Tuesday April 07 2026
03:17:31 PMFlip Answers |
| 1) | 104 * 96 = | | 1) 100 * 100 - 4 * 4 = 9984 |
| 2) | 95 * 105 = | | 2) 100 * 100 - 5 * 5 = 9975 |
| 3) | 298 * 302 = | | 3) 300 * 300 - 2 * 2 = 89996 |
| 4) | 93 * 107 = | | 4) 100 * 100 - 7 * 7 = 9951 |
| 5) | 297 * 303 = | | 5) 300 * 300 - 3 * 3 = 89991 |
| 6) | 306 * 294 = | | 6) 300 * 300 - 6 * 6 = 89964 |
| 7) | 393 * 407 = | | 7) 400 * 400 - 7 * 7 = 159951 |
| 8) | 409 * 391 = | | 8) 400 * 400 - 9 * 9 = 159919 |
| 9) | 397 * 403 = | | 9) 400 * 400 - 3 * 3 = 159991 |
| 10) | 195 * 205 = | | 10) 200 * 200 - 5 * 5 = 39975 |
| 11) | 170 * 74 - 70 * 74 = | | 11) ( 170 - 70) * 74 = 7400 |
| 12) | 59 * 127 + 73 * 59 = | | 12) ( 127 + 73) * 59 = 11800 |
| 13) | 25 * 45 + 55 * 25 = | | 13) ( 45 + 55) * 25 = 2500 |
| 14) | 77 * 42 + 158 * 77 = | | 14) ( 158 + 42) * 77 = 15400 |
| 15) | 51 * 266 - 51 * 66 = | | 15) ( 266 - 66) * 51 = 10200 |
| 16) | 53 * 69 + 47 * 69 = | | 16) ( 47 + 53) * 69 = 6900 |
| 17) | 39 * 84 + 84 * 161 = | | 17) ( 161 + 39) * 84 = 16800 |
| 18) | 148 * 96 - 96 * 48 = | | 18) ( 148 - 48) * 96 = 9600 |
| 19) | 270 * 65 - 70 * 65 = | | 19) ( 270 - 70) * 65 = 13000 |
| 20) | 73 * 250 - 73 * 50 = | | 20) ( 250 - 50) * 73 = 14600 |
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Score: ______________ | |
