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 February 09 2026
10:35:36 PM | Monday February 09 2026
10:35:36 PMFlip Answers |
| 1) | 406 * 394 = | | 1) 400 * 400 - 6 * 6 = 159964 |
| 2) | 402 * 398 = | | 2) 400 * 400 - 2 * 2 = 159996 |
| 3) | 203 * 197 = | | 3) 200 * 200 - 3 * 3 = 39991 |
| 4) | 307 * 293 = | | 4) 300 * 300 - 7 * 7 = 89951 |
| 5) | 209 * 191 = | | 5) 200 * 200 - 9 * 9 = 39919 |
| 6) | 406 * 394 = | | 6) 400 * 400 - 6 * 6 = 159964 |
| 7) | 302 * 298 = | | 7) 300 * 300 - 2 * 2 = 89996 |
| 8) | 194 * 206 = | | 8) 200 * 200 - 6 * 6 = 39964 |
| 9) | 310 * 290 = | | 9) 300 * 300 - 10 * 10 = 89900 |
| 10) | 103 * 97 = | | 10) 100 * 100 - 3 * 3 = 9991 |
| 11) | 39 * 77 + 77 * 61 = | | 11) ( 61 + 39) * 77 = 7700 |
| 12) | 72 * 247 - 72 * 47 = | | 12) ( 247 - 47) * 72 = 14400 |
| 13) | 26 * 52 + 48 * 26 = | | 13) ( 48 + 52) * 26 = 2600 |
| 14) | 48 * 152 + 48 * 48 = | | 14) ( 152 + 48) * 48 = 9600 |
| 15) | 93 * 52 + 93 * 148 = | | 15) ( 148 + 52) * 93 = 18600 |
| 16) | 48 * 270 - 48 * 70 = | | 16) ( 270 - 70) * 48 = 9600 |
| 17) | 59 * 23 + 23 * 141 = | | 17) ( 141 + 59) * 23 = 4600 |
| 18) | 235 * 86 - 35 * 86 = | | 18) ( 235 - 35) * 86 = 17200 |
| 19) | 54 * 272 - 54 * 72 = | | 19) ( 272 - 72) * 54 = 10800 |
| 20) | 29 * 27 + 29 * 73 = | | 20) ( 27 + 73) * 29 = 2900 |
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Score: ______________ | |
