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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Sunday October 04 2026
11:24:17 AM | Sunday October 04 2026
11:24:17 AMFlip Answers |
| 1) | 110 * 90 = | | 1) 100 * 100 - 10 * 10 = 9900 |
| 2) | 302 * 298 = | | 2) 300 * 300 - 2 * 2 = 89996 |
| 3) | 195 * 205 = | | 3) 200 * 200 - 5 * 5 = 39975 |
| 4) | 194 * 206 = | | 4) 200 * 200 - 6 * 6 = 39964 |
| 5) | 195 * 205 = | | 5) 200 * 200 - 5 * 5 = 39975 |
| 6) | 310 * 290 = | | 6) 300 * 300 - 10 * 10 = 89900 |
| 7) | 410 * 390 = | | 7) 400 * 400 - 10 * 10 = 159900 |
| 8) | 96 * 104 = | | 8) 100 * 100 - 4 * 4 = 9984 |
| 9) | 301 * 299 = | | 9) 300 * 300 - 1 * 1 = 89999 |
| 10) | 108 * 92 = | | 10) 100 * 100 - 8 * 8 = 9936 |
| 11) | 160 * 46 + 40 * 46 = | | 11) ( 160 + 40) * 46 = 9200 |
| 12) | 129 * 91 + 71 * 91 = | | 12) ( 129 + 71) * 91 = 18200 |
| 13) | 73 * 37 + 63 * 73 = | | 13) ( 37 + 63) * 73 = 7300 |
| 14) | 38 * 97 + 162 * 97 = | | 14) ( 162 + 38) * 97 = 19400 |
| 15) | 51 * 37 + 63 * 51 = | | 15) ( 63 + 37) * 51 = 5100 |
| 16) | 87 * 254 - 87 * 54 = | | 16) ( 254 - 54) * 87 = 17400 |
| 17) | 81 * 63 + 81 * 37 = | | 17) ( 63 + 37) * 81 = 8100 |
| 18) | 22 * 156 - 56 * 22 = | | 18) ( 156 - 56) * 22 = 2200 |
| 19) | 45 * 266 - 66 * 45 = | | 19) ( 266 - 66) * 45 = 9000 |
| 20) | 69 * 72 + 31 * 72 = | | 20) ( 31 + 69) * 72 = 7200 |
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Score: ______________ | |
