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
|
|
Sunday November 01 2026
10:04:15 AM | Sunday November 01 2026
10:04:15 AMFlip Answers |
| 1) | 201 * 199 = | | 1) 200 * 200 - 1 * 1 = 39999 |
| 2) | 98 * 102 = | | 2) 100 * 100 - 2 * 2 = 9996 |
| 3) | 91 * 109 = | | 3) 100 * 100 - 9 * 9 = 9919 |
| 4) | 399 * 401 = | | 4) 400 * 400 - 1 * 1 = 159999 |
| 5) | 292 * 308 = | | 5) 300 * 300 - 8 * 8 = 89936 |
| 6) | 95 * 105 = | | 6) 100 * 100 - 5 * 5 = 9975 |
| 7) | 203 * 197 = | | 7) 200 * 200 - 3 * 3 = 39991 |
| 8) | 304 * 296 = | | 8) 300 * 300 - 4 * 4 = 89984 |
| 9) | 201 * 199 = | | 9) 200 * 200 - 1 * 1 = 39999 |
| 10) | 103 * 97 = | | 10) 100 * 100 - 3 * 3 = 9991 |
| 11) | 48 * 59 + 52 * 59 = | | 11) ( 52 + 48) * 59 = 5900 |
| 12) | 24 * 49 + 51 * 24 = | | 12) ( 51 + 49) * 24 = 2400 |
| 13) | 147 * 29 + 53 * 29 = | | 13) ( 147 + 53) * 29 = 5800 |
| 14) | 60 * 82 + 140 * 82 = | | 14) ( 140 + 60) * 82 = 16400 |
| 15) | 47 * 28 + 53 * 28 = | | 15) ( 53 + 47) * 28 = 2800 |
| 16) | 163 * 81 - 63 * 81 = | | 16) ( 163 - 63) * 81 = 8100 |
| 17) | 57 * 270 - 70 * 57 = | | 17) ( 270 - 70) * 57 = 11400 |
| 18) | 57 * 39 + 161 * 57 = | | 18) ( 161 + 39) * 57 = 11400 |
| 19) | 72 * 274 - 72 * 74 = | | 19) ( 274 - 74) * 72 = 14400 |
| 20) | 23 * 55 + 23 * 45 = | | 20) ( 55 + 45) * 23 = 2300 |
|
Score: ______________ | |
