Math Main Page => Exercises - Math III
|
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
|
|
Tuesday August 04 2026
09:23:44 AM | Tuesday August 04 2026
09:23:44 AMFlip Answers |
| 1) | 207 * 193 = | | 1) 200 * 200 - 7 * 7 = 39951 |
| 2) | 305 * 295 = | | 2) 300 * 300 - 5 * 5 = 89975 |
| 3) | 95 * 105 = | | 3) 100 * 100 - 5 * 5 = 9975 |
| 4) | 401 * 399 = | | 4) 400 * 400 - 1 * 1 = 159999 |
| 5) | 208 * 192 = | | 5) 200 * 200 - 8 * 8 = 39936 |
| 6) | 196 * 204 = | | 6) 200 * 200 - 4 * 4 = 39984 |
| 7) | 298 * 302 = | | 7) 300 * 300 - 2 * 2 = 89996 |
| 8) | 197 * 203 = | | 8) 200 * 200 - 3 * 3 = 39991 |
| 9) | 402 * 398 = | | 9) 400 * 400 - 2 * 2 = 159996 |
| 10) | 406 * 394 = | | 10) 400 * 400 - 6 * 6 = 159964 |
| 11) | 273 * 37 - 73 * 37 = | | 11) ( 273 - 73) * 37 = 7400 |
| 12) | 74 * 43 + 57 * 74 = | | 12) ( 57 + 43) * 74 = 7400 |
| 13) | 263 * 95 - 95 * 63 = | | 13) ( 263 - 63) * 95 = 19000 |
| 14) | 96 * 56 + 96 * 44 = | | 14) ( 56 + 44) * 96 = 9600 |
| 15) | 48 * 144 + 56 * 48 = | | 15) ( 144 + 56) * 48 = 9600 |
| 16) | 247 * 32 - 32 * 47 = | | 16) ( 247 - 47) * 32 = 6400 |
| 17) | 245 * 79 - 79 * 45 = | | 17) ( 245 - 45) * 79 = 15800 |
| 18) | 159 * 70 + 70 * 41 = | | 18) ( 159 + 41) * 70 = 14000 |
| 19) | 55 * 90 + 145 * 90 = | | 19) ( 145 + 55) * 90 = 18000 |
| 20) | 95 * 67 + 133 * 95 = | | 20) ( 133 + 67) * 95 = 19000 |
|
Score: ______________ | |
