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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Monday October 05 2026
11:27:00 AM | Monday October 05 2026
11:27:00 AMFlip Answers |
| 1) | 198 * 202 = | | 1) 200 * 200 - 2 * 2 = 39996 |
| 2) | 302 * 298 = | | 2) 300 * 300 - 2 * 2 = 89996 |
| 3) | 310 * 290 = | | 3) 300 * 300 - 10 * 10 = 89900 |
| 4) | 190 * 210 = | | 4) 200 * 200 - 10 * 10 = 39900 |
| 5) | 392 * 408 = | | 5) 400 * 400 - 8 * 8 = 159936 |
| 6) | 307 * 293 = | | 6) 300 * 300 - 7 * 7 = 89951 |
| 7) | 199 * 201 = | | 7) 200 * 200 - 1 * 1 = 39999 |
| 8) | 196 * 204 = | | 8) 200 * 200 - 4 * 4 = 39984 |
| 9) | 206 * 194 = | | 9) 200 * 200 - 6 * 6 = 39964 |
| 10) | 297 * 303 = | | 10) 300 * 300 - 3 * 3 = 89991 |
| 11) | 68 * 44 + 56 * 68 = | | 11) ( 56 + 44) * 68 = 6800 |
| 12) | 80 * 35 + 80 * 165 = | | 12) ( 165 + 35) * 80 = 16000 |
| 13) | 247 * 21 - 47 * 21 = | | 13) ( 247 - 47) * 21 = 4200 |
| 14) | 141 * 63 + 59 * 63 = | | 14) ( 141 + 59) * 63 = 12600 |
| 15) | 246 * 52 - 52 * 46 = | | 15) ( 246 - 46) * 52 = 10400 |
| 16) | 37 * 76 + 76 * 63 = | | 16) ( 63 + 37) * 76 = 7600 |
| 17) | 39 * 148 + 52 * 39 = | | 17) ( 148 + 52) * 39 = 7800 |
| 18) | 74 * 41 + 74 * 59 = | | 18) ( 59 + 41) * 74 = 7400 |
| 19) | 90 * 148 + 90 * 52 = | | 19) ( 148 + 52) * 90 = 18000 |
| 20) | 240 * 31 - 31 * 40 = | | 20) ( 240 - 40) * 31 = 6200 |
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Score: ______________ | |
