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 February 06 2026
03:05:34 AM | Friday February 06 2026
03:05:34 AMFlip Answers |
| 1) | 198 * 202 = | | 1) 200 * 200 - 2 * 2 = 39996 |
| 2) | 201 * 199 = | | 2) 200 * 200 - 1 * 1 = 39999 |
| 3) | 192 * 208 = | | 3) 200 * 200 - 8 * 8 = 39936 |
| 4) | 304 * 296 = | | 4) 300 * 300 - 4 * 4 = 89984 |
| 5) | 98 * 102 = | | 5) 100 * 100 - 2 * 2 = 9996 |
| 6) | 406 * 394 = | | 6) 400 * 400 - 6 * 6 = 159964 |
| 7) | 190 * 210 = | | 7) 200 * 200 - 10 * 10 = 39900 |
| 8) | 90 * 110 = | | 8) 100 * 100 - 10 * 10 = 9900 |
| 9) | 390 * 410 = | | 9) 400 * 400 - 10 * 10 = 159900 |
| 10) | 297 * 303 = | | 10) 300 * 300 - 3 * 3 = 89991 |
| 11) | 88 * 159 - 59 * 88 = | | 11) ( 159 - 59) * 88 = 8800 |
| 12) | 162 * 49 - 62 * 49 = | | 12) ( 162 - 62) * 49 = 4900 |
| 13) | 38 * 78 + 62 * 78 = | | 13) ( 38 + 62) * 78 = 7800 |
| 14) | 56 * 58 + 58 * 44 = | | 14) ( 44 + 56) * 58 = 5800 |
| 15) | 26 * 152 - 26 * 52 = | | 15) ( 152 - 52) * 26 = 2600 |
| 16) | 95 * 45 + 55 * 95 = | | 16) ( 55 + 45) * 95 = 9500 |
| 17) | 74 * 46 + 54 * 74 = | | 17) ( 46 + 54) * 74 = 7400 |
| 18) | 253 * 79 - 53 * 79 = | | 18) ( 253 - 53) * 79 = 15800 |
| 19) | 59 * 148 + 52 * 59 = | | 19) ( 148 + 52) * 59 = 11800 |
| 20) | 68 * 175 - 75 * 68 = | | 20) ( 175 - 75) * 68 = 6800 |
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Score: ______________ | |
