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 September 18 2026
10:15:26 AM | Friday September 18 2026
10:15:26 AMFlip Answers |
| 1) | 394 * 406 = | | 1) 400 * 400 - 6 * 6 = 159964 |
| 2) | 197 * 203 = | | 2) 200 * 200 - 3 * 3 = 39991 |
| 3) | 202 * 198 = | | 3) 200 * 200 - 2 * 2 = 39996 |
| 4) | 292 * 308 = | | 4) 300 * 300 - 8 * 8 = 89936 |
| 5) | 197 * 203 = | | 5) 200 * 200 - 3 * 3 = 39991 |
| 6) | 301 * 299 = | | 6) 300 * 300 - 1 * 1 = 89999 |
| 7) | 107 * 93 = | | 7) 100 * 100 - 7 * 7 = 9951 |
| 8) | 393 * 407 = | | 8) 400 * 400 - 7 * 7 = 159951 |
| 9) | 390 * 410 = | | 9) 400 * 400 - 10 * 10 = 159900 |
| 10) | 298 * 302 = | | 10) 300 * 300 - 2 * 2 = 89996 |
| 11) | 247 * 49 - 49 * 47 = | | 11) ( 247 - 47) * 49 = 9800 |
| 12) | 60 * 131 + 69 * 60 = | | 12) ( 131 + 69) * 60 = 12000 |
| 13) | 67 * 255 - 55 * 67 = | | 13) ( 255 - 55) * 67 = 13400 |
| 14) | 153 * 45 - 53 * 45 = | | 14) ( 153 - 53) * 45 = 4500 |
| 15) | 56 * 33 + 144 * 33 = | | 15) ( 144 + 56) * 33 = 6600 |
| 16) | 158 * 64 - 64 * 58 = | | 16) ( 158 - 58) * 64 = 6400 |
| 17) | 74 * 57 + 43 * 74 = | | 17) ( 57 + 43) * 74 = 7400 |
| 18) | 245 * 34 - 34 * 45 = | | 18) ( 245 - 45) * 34 = 6800 |
| 19) | 41 * 264 - 41 * 64 = | | 19) ( 264 - 64) * 41 = 8200 |
| 20) | 152 * 38 - 52 * 38 = | | 20) ( 152 - 52) * 38 = 3800 |
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Score: ______________ | |
