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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Saturday July 25 2026
08:56:38 PM | Saturday July 25 2026
08:56:38 PMFlip Answers |
| 1) | 193 * 207 = | | 1) 200 * 200 - 7 * 7 = 39951 |
| 2) | 194 * 206 = | | 2) 200 * 200 - 6 * 6 = 39964 |
| 3) | 292 * 308 = | | 3) 300 * 300 - 8 * 8 = 89936 |
| 4) | 192 * 208 = | | 4) 200 * 200 - 8 * 8 = 39936 |
| 5) | 301 * 299 = | | 5) 300 * 300 - 1 * 1 = 89999 |
| 6) | 97 * 103 = | | 6) 100 * 100 - 3 * 3 = 9991 |
| 7) | 94 * 106 = | | 7) 100 * 100 - 6 * 6 = 9964 |
| 8) | 190 * 210 = | | 8) 200 * 200 - 10 * 10 = 39900 |
| 9) | 297 * 303 = | | 9) 300 * 300 - 3 * 3 = 89991 |
| 10) | 403 * 397 = | | 10) 400 * 400 - 3 * 3 = 159991 |
| 11) | 130 * 23 + 70 * 23 = | | 11) ( 130 + 70) * 23 = 4600 |
| 12) | 89 * 58 + 89 * 42 = | | 12) ( 42 + 58) * 89 = 8900 |
| 13) | 73 * 168 - 68 * 73 = | | 13) ( 168 - 68) * 73 = 7300 |
| 14) | 72 * 243 - 43 * 72 = | | 14) ( 243 - 43) * 72 = 14400 |
| 15) | 33 * 62 + 38 * 33 = | | 15) ( 38 + 62) * 33 = 3300 |
| 16) | 90 * 265 - 65 * 90 = | | 16) ( 265 - 65) * 90 = 18000 |
| 17) | 253 * 76 - 76 * 53 = | | 17) ( 253 - 53) * 76 = 15200 |
| 18) | 56 * 145 - 56 * 45 = | | 18) ( 145 - 45) * 56 = 5600 |
| 19) | 269 * 59 - 59 * 69 = | | 19) ( 269 - 69) * 59 = 11800 |
| 20) | 52 * 235 - 35 * 52 = | | 20) ( 235 - 35) * 52 = 10400 |
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Score: ______________ | |
