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
|
|
Saturday July 18 2026
12:12:02 PM | Saturday July 18 2026
12:12:02 PMFlip Answers |
| 1) | 295 * 305 = | | 1) 300 * 300 - 5 * 5 = 89975 |
| 2) | 310 * 290 = | | 2) 300 * 300 - 10 * 10 = 89900 |
| 3) | 397 * 403 = | | 3) 400 * 400 - 3 * 3 = 159991 |
| 4) | 96 * 104 = | | 4) 100 * 100 - 4 * 4 = 9984 |
| 5) | 193 * 207 = | | 5) 200 * 200 - 7 * 7 = 39951 |
| 6) | 409 * 391 = | | 6) 400 * 400 - 9 * 9 = 159919 |
| 7) | 391 * 409 = | | 7) 400 * 400 - 9 * 9 = 159919 |
| 8) | 199 * 201 = | | 8) 200 * 200 - 1 * 1 = 39999 |
| 9) | 209 * 191 = | | 9) 200 * 200 - 9 * 9 = 39919 |
| 10) | 302 * 298 = | | 10) 300 * 300 - 2 * 2 = 89996 |
| 11) | 74 * 160 - 74 * 60 = | | 11) ( 160 - 60) * 74 = 7400 |
| 12) | 48 * 248 - 48 * 48 = | | 12) ( 248 - 48) * 48 = 9600 |
| 13) | 44 * 97 + 97 * 156 = | | 13) ( 156 + 44) * 97 = 19400 |
| 14) | 55 * 130 + 70 * 55 = | | 14) ( 130 + 70) * 55 = 11000 |
| 15) | 37 * 60 + 60 * 63 = | | 15) ( 63 + 37) * 60 = 6000 |
| 16) | 61 * 151 - 61 * 51 = | | 16) ( 151 - 51) * 61 = 6100 |
| 17) | 73 * 254 - 73 * 54 = | | 17) ( 254 - 54) * 73 = 14600 |
| 18) | 25 * 81 + 75 * 81 = | | 18) ( 25 + 75) * 81 = 8100 |
| 19) | 74 * 169 - 69 * 74 = | | 19) ( 169 - 69) * 74 = 7400 |
| 20) | 62 * 249 - 49 * 62 = | | 20) ( 249 - 49) * 62 = 12400 |
|
Score: ______________ | |
