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
|
|
Friday September 04 2026
11:57:54 AM | Friday September 04 2026
11:57:54 AMFlip Answers |
| 1) | 103 * 97 = | | 1) 100 * 100 - 3 * 3 = 9991 |
| 2) | 102 * 98 = | | 2) 100 * 100 - 2 * 2 = 9996 |
| 3) | 91 * 109 = | | 3) 100 * 100 - 9 * 9 = 9919 |
| 4) | 294 * 306 = | | 4) 300 * 300 - 6 * 6 = 89964 |
| 5) | 193 * 207 = | | 5) 200 * 200 - 7 * 7 = 39951 |
| 6) | 407 * 393 = | | 6) 400 * 400 - 7 * 7 = 159951 |
| 7) | 409 * 391 = | | 7) 400 * 400 - 9 * 9 = 159919 |
| 8) | 93 * 107 = | | 8) 100 * 100 - 7 * 7 = 9951 |
| 9) | 101 * 99 = | | 9) 100 * 100 - 1 * 1 = 9999 |
| 10) | 202 * 198 = | | 10) 200 * 200 - 2 * 2 = 39996 |
| 11) | 36 * 40 + 60 * 36 = | | 11) ( 60 + 40) * 36 = 3600 |
| 12) | 163 * 60 + 60 * 37 = | | 12) ( 163 + 37) * 60 = 12000 |
| 13) | 94 * 44 + 56 * 94 = | | 13) ( 56 + 44) * 94 = 9400 |
| 14) | 34 * 24 + 24 * 66 = | | 14) ( 34 + 66) * 24 = 2400 |
| 15) | 46 * 26 + 54 * 26 = | | 15) ( 46 + 54) * 26 = 2600 |
| 16) | 68 * 163 - 68 * 63 = | | 16) ( 163 - 63) * 68 = 6800 |
| 17) | 36 * 236 - 36 * 36 = | | 17) ( 236 - 36) * 36 = 7200 |
| 18) | 46 * 79 + 154 * 79 = | | 18) ( 154 + 46) * 79 = 15800 |
| 19) | 92 * 63 + 92 * 137 = | | 19) ( 137 + 63) * 92 = 18400 |
| 20) | 66 * 249 - 49 * 66 = | | 20) ( 249 - 49) * 66 = 13200 |
|
Score: ______________ | |
