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 March 28 2026
12:23:15 PM | Saturday March 28 2026
12:23:15 PMFlip Answers |
| 1) | 309 * 291 = | | 1) 300 * 300 - 9 * 9 = 89919 |
| 2) | 197 * 203 = | | 2) 200 * 200 - 3 * 3 = 39991 |
| 3) | 102 * 98 = | | 3) 100 * 100 - 2 * 2 = 9996 |
| 4) | 409 * 391 = | | 4) 400 * 400 - 9 * 9 = 159919 |
| 5) | 296 * 304 = | | 5) 300 * 300 - 4 * 4 = 89984 |
| 6) | 296 * 304 = | | 6) 300 * 300 - 4 * 4 = 89984 |
| 7) | 106 * 94 = | | 7) 100 * 100 - 6 * 6 = 9964 |
| 8) | 106 * 94 = | | 8) 100 * 100 - 6 * 6 = 9964 |
| 9) | 296 * 304 = | | 9) 300 * 300 - 4 * 4 = 89984 |
| 10) | 98 * 102 = | | 10) 100 * 100 - 2 * 2 = 9996 |
| 11) | 58 * 150 - 58 * 50 = | | 11) ( 150 - 50) * 58 = 5800 |
| 12) | 84 * 166 - 66 * 84 = | | 12) ( 166 - 66) * 84 = 8400 |
| 13) | 275 * 42 - 75 * 42 = | | 13) ( 275 - 75) * 42 = 8400 |
| 14) | 48 * 61 + 139 * 48 = | | 14) ( 139 + 61) * 48 = 9600 |
| 15) | 63 * 56 + 56 * 37 = | | 15) ( 63 + 37) * 56 = 5600 |
| 16) | 142 * 27 + 58 * 27 = | | 16) ( 142 + 58) * 27 = 5400 |
| 17) | 235 * 73 - 73 * 35 = | | 17) ( 235 - 35) * 73 = 14600 |
| 18) | 24 * 261 - 24 * 61 = | | 18) ( 261 - 61) * 24 = 4800 |
| 19) | 32 * 262 - 32 * 62 = | | 19) ( 262 - 62) * 32 = 6400 |
| 20) | 152 * 91 - 91 * 52 = | | 20) ( 152 - 52) * 91 = 9100 |
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Score: ______________ | |
