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
|
|
Thursday February 05 2026
08:56:10 PM | Thursday February 05 2026
08:56:10 PMFlip Answers |
| 1) | 97 * 103 = | | 1) 100 * 100 - 3 * 3 = 9991 |
| 2) | 397 * 403 = | | 2) 400 * 400 - 3 * 3 = 159991 |
| 3) | 92 * 108 = | | 3) 100 * 100 - 8 * 8 = 9936 |
| 4) | 298 * 302 = | | 4) 300 * 300 - 2 * 2 = 89996 |
| 5) | 292 * 308 = | | 5) 300 * 300 - 8 * 8 = 89936 |
| 6) | 291 * 309 = | | 6) 300 * 300 - 9 * 9 = 89919 |
| 7) | 194 * 206 = | | 7) 200 * 200 - 6 * 6 = 39964 |
| 8) | 193 * 207 = | | 8) 200 * 200 - 7 * 7 = 39951 |
| 9) | 92 * 108 = | | 9) 100 * 100 - 8 * 8 = 9936 |
| 10) | 103 * 97 = | | 10) 100 * 100 - 3 * 3 = 9991 |
| 11) | 92 * 264 - 92 * 64 = | | 11) ( 264 - 64) * 92 = 18400 |
| 12) | 45 * 250 - 50 * 45 = | | 12) ( 250 - 50) * 45 = 9000 |
| 13) | 55 * 275 - 55 * 75 = | | 13) ( 275 - 75) * 55 = 11000 |
| 14) | 151 * 84 - 84 * 51 = | | 14) ( 151 - 51) * 84 = 8400 |
| 15) | 40 * 242 - 42 * 40 = | | 15) ( 242 - 42) * 40 = 8000 |
| 16) | 69 * 59 + 131 * 59 = | | 16) ( 131 + 69) * 59 = 11800 |
| 17) | 48 * 127 + 48 * 73 = | | 17) ( 127 + 73) * 48 = 9600 |
| 18) | 67 * 52 + 52 * 33 = | | 18) ( 33 + 67) * 52 = 5200 |
| 19) | 57 * 152 + 48 * 57 = | | 19) ( 152 + 48) * 57 = 11400 |
| 20) | 92 * 242 - 42 * 92 = | | 20) ( 242 - 42) * 92 = 18400 |
|
Score: ______________ | |
