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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Tuesday January 13 2026
04:12:42 AM | Tuesday January 13 2026
04:12:42 AMFlip Answers |
| 1) | 191 * 209 = | | 1) 200 * 200 - 9 * 9 = 39919 |
| 2) | 296 * 304 = | | 2) 300 * 300 - 4 * 4 = 89984 |
| 3) | 403 * 397 = | | 3) 400 * 400 - 3 * 3 = 159991 |
| 4) | 209 * 191 = | | 4) 200 * 200 - 9 * 9 = 39919 |
| 5) | 104 * 96 = | | 5) 100 * 100 - 4 * 4 = 9984 |
| 6) | 294 * 306 = | | 6) 300 * 300 - 6 * 6 = 89964 |
| 7) | 91 * 109 = | | 7) 100 * 100 - 9 * 9 = 9919 |
| 8) | 199 * 201 = | | 8) 200 * 200 - 1 * 1 = 39999 |
| 9) | 198 * 202 = | | 9) 200 * 200 - 2 * 2 = 39996 |
| 10) | 299 * 301 = | | 10) 300 * 300 - 1 * 1 = 89999 |
| 11) | 92 * 45 + 55 * 92 = | | 11) ( 55 + 45) * 92 = 9200 |
| 12) | 157 * 37 - 57 * 37 = | | 12) ( 157 - 57) * 37 = 3700 |
| 13) | 47 * 85 + 153 * 85 = | | 13) ( 153 + 47) * 85 = 17000 |
| 14) | 253 * 58 - 53 * 58 = | | 14) ( 253 - 53) * 58 = 11600 |
| 15) | 59 * 239 - 39 * 59 = | | 15) ( 239 - 39) * 59 = 11800 |
| 16) | 47 * 63 + 137 * 47 = | | 16) ( 137 + 63) * 47 = 9400 |
| 17) | 49 * 162 - 49 * 62 = | | 17) ( 162 - 62) * 49 = 4900 |
| 18) | 64 * 159 + 41 * 64 = | | 18) ( 159 + 41) * 64 = 12800 |
| 19) | 48 * 141 - 48 * 41 = | | 19) ( 141 - 41) * 48 = 4800 |
| 20) | 64 * 269 - 69 * 64 = | | 20) ( 269 - 69) * 64 = 12800 |
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Score: ______________ | |
