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
|
|
Wednesday November 26 2025
11:41:49 PM | Wednesday November 26 2025
11:41:49 PMFlip Answers |
| 1) | 295 * 305 = | | 1) 300 * 300 - 5 * 5 = 89975 |
| 2) | 99 * 101 = | | 2) 100 * 100 - 1 * 1 = 9999 |
| 3) | 103 * 97 = | | 3) 100 * 100 - 3 * 3 = 9991 |
| 4) | 96 * 104 = | | 4) 100 * 100 - 4 * 4 = 9984 |
| 5) | 310 * 290 = | | 5) 300 * 300 - 10 * 10 = 89900 |
| 6) | 107 * 93 = | | 6) 100 * 100 - 7 * 7 = 9951 |
| 7) | 199 * 201 = | | 7) 200 * 200 - 1 * 1 = 39999 |
| 8) | 103 * 97 = | | 8) 100 * 100 - 3 * 3 = 9991 |
| 9) | 291 * 309 = | | 9) 300 * 300 - 9 * 9 = 89919 |
| 10) | 106 * 94 = | | 10) 100 * 100 - 6 * 6 = 9964 |
| 11) | 51 * 54 + 146 * 51 = | | 11) ( 146 + 54) * 51 = 10200 |
| 12) | 50 * 46 + 46 * 150 = | | 12) ( 150 + 50) * 46 = 9200 |
| 13) | 37 * 22 + 163 * 22 = | | 13) ( 163 + 37) * 22 = 4400 |
| 14) | 56 * 73 + 73 * 44 = | | 14) ( 44 + 56) * 73 = 7300 |
| 15) | 69 * 162 - 69 * 62 = | | 15) ( 162 - 62) * 69 = 6900 |
| 16) | 41 * 31 + 31 * 59 = | | 16) ( 41 + 59) * 31 = 3100 |
| 17) | 268 * 56 - 68 * 56 = | | 17) ( 268 - 68) * 56 = 11200 |
| 18) | 91 * 158 - 58 * 91 = | | 18) ( 158 - 58) * 91 = 9100 |
| 19) | 157 * 85 - 85 * 57 = | | 19) ( 157 - 57) * 85 = 8500 |
| 20) | 161 * 63 - 63 * 61 = | | 20) ( 161 - 61) * 63 = 6300 |
|
Score: ______________ | |
