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 March 24 2026
01:14:47 AM | Tuesday March 24 2026
01:14:47 AMFlip Answers |
| 1) | 395 * 405 = | | 1) 400 * 400 - 5 * 5 = 159975 |
| 2) | 297 * 303 = | | 2) 300 * 300 - 3 * 3 = 89991 |
| 3) | 392 * 408 = | | 3) 400 * 400 - 8 * 8 = 159936 |
| 4) | 102 * 98 = | | 4) 100 * 100 - 2 * 2 = 9996 |
| 5) | 309 * 291 = | | 5) 300 * 300 - 9 * 9 = 89919 |
| 6) | 403 * 397 = | | 6) 400 * 400 - 3 * 3 = 159991 |
| 7) | 207 * 193 = | | 7) 200 * 200 - 7 * 7 = 39951 |
| 8) | 190 * 210 = | | 8) 200 * 200 - 10 * 10 = 39900 |
| 9) | 103 * 97 = | | 9) 100 * 100 - 3 * 3 = 9991 |
| 10) | 297 * 303 = | | 10) 300 * 300 - 3 * 3 = 89991 |
| 11) | 56 * 50 + 56 * 50 = | | 11) ( 50 + 50) * 56 = 5600 |
| 12) | 269 * 33 - 69 * 33 = | | 12) ( 269 - 69) * 33 = 6600 |
| 13) | 162 * 23 - 62 * 23 = | | 13) ( 162 - 62) * 23 = 2300 |
| 14) | 148 * 94 - 48 * 94 = | | 14) ( 148 - 48) * 94 = 9400 |
| 15) | 55 * 28 + 28 * 145 = | | 15) ( 145 + 55) * 28 = 5600 |
| 16) | 97 * 250 - 97 * 50 = | | 16) ( 250 - 50) * 97 = 19400 |
| 17) | 72 * 41 + 159 * 72 = | | 17) ( 159 + 41) * 72 = 14400 |
| 18) | 41 * 44 + 56 * 41 = | | 18) ( 56 + 44) * 41 = 4100 |
| 19) | 77 * 142 + 77 * 58 = | | 19) ( 142 + 58) * 77 = 15400 |
| 20) | 85 * 238 - 38 * 85 = | | 20) ( 238 - 38) * 85 = 17000 |
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Score: ______________ | |
