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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Friday April 24 2026
08:54:10 PM | Friday April 24 2026
08:54:10 PMFlip Answers |
| 1) | 290 * 310 = | | 1) 300 * 300 - 10 * 10 = 89900 |
| 2) | 406 * 394 = | | 2) 400 * 400 - 6 * 6 = 159964 |
| 3) | 201 * 199 = | | 3) 200 * 200 - 1 * 1 = 39999 |
| 4) | 394 * 406 = | | 4) 400 * 400 - 6 * 6 = 159964 |
| 5) | 198 * 202 = | | 5) 200 * 200 - 2 * 2 = 39996 |
| 6) | 301 * 299 = | | 6) 300 * 300 - 1 * 1 = 89999 |
| 7) | 401 * 399 = | | 7) 400 * 400 - 1 * 1 = 159999 |
| 8) | 308 * 292 = | | 8) 300 * 300 - 8 * 8 = 89936 |
| 9) | 299 * 301 = | | 9) 300 * 300 - 1 * 1 = 89999 |
| 10) | 101 * 99 = | | 10) 100 * 100 - 1 * 1 = 9999 |
| 11) | 65 * 136 + 64 * 65 = | | 11) ( 136 + 64) * 65 = 13000 |
| 12) | 29 * 133 + 67 * 29 = | | 12) ( 133 + 67) * 29 = 5800 |
| 13) | 44 * 70 + 56 * 70 = | | 13) ( 44 + 56) * 70 = 7000 |
| 14) | 54 * 153 - 53 * 54 = | | 14) ( 153 - 53) * 54 = 5400 |
| 15) | 38 * 175 - 38 * 75 = | | 15) ( 175 - 75) * 38 = 3800 |
| 16) | 158 * 27 - 27 * 58 = | | 16) ( 158 - 58) * 27 = 2700 |
| 17) | 63 * 254 - 63 * 54 = | | 17) ( 254 - 54) * 63 = 12600 |
| 18) | 67 * 146 - 46 * 67 = | | 18) ( 146 - 46) * 67 = 6700 |
| 19) | 91 * 136 - 91 * 36 = | | 19) ( 136 - 36) * 91 = 9100 |
| 20) | 48 * 47 + 48 * 153 = | | 20) ( 153 + 47) * 48 = 9600 |
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Score: ______________ | |
