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 September 29 2026
05:55:32 AM | Tuesday September 29 2026
05:55:32 AMFlip Answers |
| 1) | 106 * 94 = | | 1) 100 * 100 - 6 * 6 = 9964 |
| 2) | 399 * 401 = | | 2) 400 * 400 - 1 * 1 = 159999 |
| 3) | 110 * 90 = | | 3) 100 * 100 - 10 * 10 = 9900 |
| 4) | 195 * 205 = | | 4) 200 * 200 - 5 * 5 = 39975 |
| 5) | 199 * 201 = | | 5) 200 * 200 - 1 * 1 = 39999 |
| 6) | 94 * 106 = | | 6) 100 * 100 - 6 * 6 = 9964 |
| 7) | 97 * 103 = | | 7) 100 * 100 - 3 * 3 = 9991 |
| 8) | 307 * 293 = | | 8) 300 * 300 - 7 * 7 = 89951 |
| 9) | 406 * 394 = | | 9) 400 * 400 - 6 * 6 = 159964 |
| 10) | 104 * 96 = | | 10) 100 * 100 - 4 * 4 = 9984 |
| 11) | 237 * 67 - 67 * 37 = | | 11) ( 237 - 37) * 67 = 13400 |
| 12) | 29 * 250 - 29 * 50 = | | 12) ( 250 - 50) * 29 = 5800 |
| 13) | 34 * 22 + 66 * 22 = | | 13) ( 34 + 66) * 22 = 2200 |
| 14) | 252 * 89 - 52 * 89 = | | 14) ( 252 - 52) * 89 = 17800 |
| 15) | 147 * 65 - 47 * 65 = | | 15) ( 147 - 47) * 65 = 6500 |
| 16) | 175 * 79 - 75 * 79 = | | 16) ( 175 - 75) * 79 = 7900 |
| 17) | 73 * 141 + 59 * 73 = | | 17) ( 141 + 59) * 73 = 14600 |
| 18) | 24 * 145 - 24 * 45 = | | 18) ( 145 - 45) * 24 = 2400 |
| 19) | 156 * 62 + 44 * 62 = | | 19) ( 156 + 44) * 62 = 12400 |
| 20) | 163 * 75 + 75 * 37 = | | 20) ( 163 + 37) * 75 = 15000 |
|
Score: ______________ | |
