Math Main Page => Exercises - Math III
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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
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Thursday January 22 2026
03:57:59 PM | Thursday January 22 2026
03:57:59 PMFlip Answers |
| 1) | 290 * 310 = | | 1) 300 * 300 - 10 * 10 = 89900 |
| 2) | 192 * 208 = | | 2) 200 * 200 - 8 * 8 = 39936 |
| 3) | 305 * 295 = | | 3) 300 * 300 - 5 * 5 = 89975 |
| 4) | 299 * 301 = | | 4) 300 * 300 - 1 * 1 = 89999 |
| 5) | 196 * 204 = | | 5) 200 * 200 - 4 * 4 = 39984 |
| 6) | 403 * 397 = | | 6) 400 * 400 - 3 * 3 = 159991 |
| 7) | 202 * 198 = | | 7) 200 * 200 - 2 * 2 = 39996 |
| 8) | 406 * 394 = | | 8) 400 * 400 - 6 * 6 = 159964 |
| 9) | 305 * 295 = | | 9) 300 * 300 - 5 * 5 = 89975 |
| 10) | 293 * 307 = | | 10) 300 * 300 - 7 * 7 = 89951 |
| 11) | 59 * 151 - 51 * 59 = | | 11) ( 151 - 51) * 59 = 5900 |
| 12) | 256 * 39 - 56 * 39 = | | 12) ( 256 - 56) * 39 = 7800 |
| 13) | 28 * 56 + 44 * 28 = | | 13) ( 44 + 56) * 28 = 2800 |
| 14) | 80 * 275 - 80 * 75 = | | 14) ( 275 - 75) * 80 = 16000 |
| 15) | 51 * 138 - 38 * 51 = | | 15) ( 138 - 38) * 51 = 5100 |
| 16) | 36 * 83 + 164 * 83 = | | 16) ( 164 + 36) * 83 = 16600 |
| 17) | 165 * 90 - 90 * 65 = | | 17) ( 165 - 65) * 90 = 9000 |
| 18) | 166 * 25 - 25 * 66 = | | 18) ( 166 - 66) * 25 = 2500 |
| 19) | 64 * 158 + 64 * 42 = | | 19) ( 158 + 42) * 64 = 12800 |
| 20) | 45 * 148 - 45 * 48 = | | 20) ( 148 - 48) * 45 = 4500 |
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Score: ______________ | |
