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 May 19 2026
03:20:22 PM | Tuesday May 19 2026
03:20:22 PMFlip Answers |
| 1) | 109 * 91 = | | 1) 100 * 100 - 9 * 9 = 9919 |
| 2) | 94 * 106 = | | 2) 100 * 100 - 6 * 6 = 9964 |
| 3) | 292 * 308 = | | 3) 300 * 300 - 8 * 8 = 89936 |
| 4) | 307 * 293 = | | 4) 300 * 300 - 7 * 7 = 89951 |
| 5) | 299 * 301 = | | 5) 300 * 300 - 1 * 1 = 89999 |
| 6) | 92 * 108 = | | 6) 100 * 100 - 8 * 8 = 9936 |
| 7) | 209 * 191 = | | 7) 200 * 200 - 9 * 9 = 39919 |
| 8) | 301 * 299 = | | 8) 300 * 300 - 1 * 1 = 89999 |
| 9) | 195 * 205 = | | 9) 200 * 200 - 5 * 5 = 39975 |
| 10) | 104 * 96 = | | 10) 100 * 100 - 4 * 4 = 9984 |
| 11) | 74 * 88 + 26 * 88 = | | 11) ( 26 + 74) * 88 = 8800 |
| 12) | 158 * 88 - 58 * 88 = | | 12) ( 158 - 58) * 88 = 8800 |
| 13) | 76 * 248 - 48 * 76 = | | 13) ( 248 - 48) * 76 = 15200 |
| 14) | 75 * 29 + 29 * 25 = | | 14) ( 25 + 75) * 29 = 2900 |
| 15) | 31 * 53 + 47 * 31 = | | 15) ( 47 + 53) * 31 = 3100 |
| 16) | 159 * 75 - 59 * 75 = | | 16) ( 159 - 59) * 75 = 7500 |
| 17) | 42 * 51 + 49 * 42 = | | 17) ( 51 + 49) * 42 = 4200 |
| 18) | 254 * 33 - 33 * 54 = | | 18) ( 254 - 54) * 33 = 6600 |
| 19) | 88 * 55 + 88 * 145 = | | 19) ( 145 + 55) * 88 = 17600 |
| 20) | 32 * 275 - 75 * 32 = | | 20) ( 275 - 75) * 32 = 6400 |
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Score: ______________ | |
