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 October 06 2026
01:47:59 PM | Tuesday October 06 2026
01:47:59 PMFlip Answers |
| 1) | 94 * 106 = | | 1) 100 * 100 - 6 * 6 = 9964 |
| 2) | 202 * 198 = | | 2) 200 * 200 - 2 * 2 = 39996 |
| 3) | 192 * 208 = | | 3) 200 * 200 - 8 * 8 = 39936 |
| 4) | 309 * 291 = | | 4) 300 * 300 - 9 * 9 = 89919 |
| 5) | 99 * 101 = | | 5) 100 * 100 - 1 * 1 = 9999 |
| 6) | 303 * 297 = | | 6) 300 * 300 - 3 * 3 = 89991 |
| 7) | 391 * 409 = | | 7) 400 * 400 - 9 * 9 = 159919 |
| 8) | 103 * 97 = | | 8) 100 * 100 - 3 * 3 = 9991 |
| 9) | 191 * 209 = | | 9) 200 * 200 - 9 * 9 = 39919 |
| 10) | 97 * 103 = | | 10) 100 * 100 - 3 * 3 = 9991 |
| 11) | 73 * 56 + 73 * 44 = | | 11) ( 44 + 56) * 73 = 7300 |
| 12) | 80 * 134 + 80 * 66 = | | 12) ( 134 + 66) * 80 = 16000 |
| 13) | 92 * 138 + 62 * 92 = | | 13) ( 138 + 62) * 92 = 18400 |
| 14) | 150 * 31 + 50 * 31 = | | 14) ( 150 + 50) * 31 = 6200 |
| 15) | 44 * 150 + 50 * 44 = | | 15) ( 150 + 50) * 44 = 8800 |
| 16) | 256 * 62 - 56 * 62 = | | 16) ( 256 - 56) * 62 = 12400 |
| 17) | 56 * 36 + 36 * 44 = | | 17) ( 44 + 56) * 36 = 3600 |
| 18) | 36 * 31 + 31 * 164 = | | 18) ( 164 + 36) * 31 = 6200 |
| 19) | 80 * 53 + 147 * 80 = | | 19) ( 147 + 53) * 80 = 16000 |
| 20) | 96 * 160 - 60 * 96 = | | 20) ( 160 - 60) * 96 = 9600 |
|
Score: ______________ | |
