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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Wednesday November 04 2026
11:50:13 AM | Wednesday November 04 2026
11:50:13 AMFlip Answers |
| 1) | 208 * 192 = | | 1) 200 * 200 - 8 * 8 = 39936 |
| 2) | 294 * 306 = | | 2) 300 * 300 - 6 * 6 = 89964 |
| 3) | 96 * 104 = | | 3) 100 * 100 - 4 * 4 = 9984 |
| 4) | 190 * 210 = | | 4) 200 * 200 - 10 * 10 = 39900 |
| 5) | 393 * 407 = | | 5) 400 * 400 - 7 * 7 = 159951 |
| 6) | 193 * 207 = | | 6) 200 * 200 - 7 * 7 = 39951 |
| 7) | 405 * 395 = | | 7) 400 * 400 - 5 * 5 = 159975 |
| 8) | 290 * 310 = | | 8) 300 * 300 - 10 * 10 = 89900 |
| 9) | 109 * 91 = | | 9) 100 * 100 - 9 * 9 = 9919 |
| 10) | 402 * 398 = | | 10) 400 * 400 - 2 * 2 = 159996 |
| 11) | 49 * 131 + 69 * 49 = | | 11) ( 131 + 69) * 49 = 9800 |
| 12) | 65 * 173 - 73 * 65 = | | 12) ( 173 - 73) * 65 = 6500 |
| 13) | 48 * 237 - 48 * 37 = | | 13) ( 237 - 37) * 48 = 9600 |
| 14) | 62 * 69 + 69 * 138 = | | 14) ( 138 + 62) * 69 = 13800 |
| 15) | 61 * 90 + 39 * 90 = | | 15) ( 61 + 39) * 90 = 9000 |
| 16) | 49 * 63 + 51 * 63 = | | 16) ( 51 + 49) * 63 = 6300 |
| 17) | 66 * 43 + 66 * 57 = | | 17) ( 43 + 57) * 66 = 6600 |
| 18) | 274 * 22 - 22 * 74 = | | 18) ( 274 - 74) * 22 = 4400 |
| 19) | 76 * 245 - 76 * 45 = | | 19) ( 245 - 45) * 76 = 15200 |
| 20) | 70 * 40 + 60 * 70 = | | 20) ( 40 + 60) * 70 = 7000 |
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Score: ______________ | |
