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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Sunday January 25 2026
07:42:34 PM | Sunday January 25 2026
07:42:34 PMFlip Answers |
| 1) | 306 * 294 = | | 1) 300 * 300 - 6 * 6 = 89964 |
| 2) | 206 * 194 = | | 2) 200 * 200 - 6 * 6 = 39964 |
| 3) | 209 * 191 = | | 3) 200 * 200 - 9 * 9 = 39919 |
| 4) | 199 * 201 = | | 4) 200 * 200 - 1 * 1 = 39999 |
| 5) | 409 * 391 = | | 5) 400 * 400 - 9 * 9 = 159919 |
| 6) | 201 * 199 = | | 6) 200 * 200 - 1 * 1 = 39999 |
| 7) | 191 * 209 = | | 7) 200 * 200 - 9 * 9 = 39919 |
| 8) | 97 * 103 = | | 8) 100 * 100 - 3 * 3 = 9991 |
| 9) | 397 * 403 = | | 9) 400 * 400 - 3 * 3 = 159991 |
| 10) | 99 * 101 = | | 10) 100 * 100 - 1 * 1 = 9999 |
| 11) | 55 * 61 + 61 * 45 = | | 11) ( 45 + 55) * 61 = 6100 |
| 12) | 48 * 142 + 48 * 58 = | | 12) ( 142 + 58) * 48 = 9600 |
| 13) | 143 * 40 + 40 * 57 = | | 13) ( 143 + 57) * 40 = 8000 |
| 14) | 160 * 73 + 40 * 73 = | | 14) ( 160 + 40) * 73 = 14600 |
| 15) | 43 * 78 + 78 * 57 = | | 15) ( 43 + 57) * 78 = 7800 |
| 16) | 274 * 68 - 68 * 74 = | | 16) ( 274 - 74) * 68 = 13600 |
| 17) | 48 * 25 + 25 * 52 = | | 17) ( 52 + 48) * 25 = 2500 |
| 18) | 75 * 148 - 48 * 75 = | | 18) ( 148 - 48) * 75 = 7500 |
| 19) | 59 * 269 - 59 * 69 = | | 19) ( 269 - 69) * 59 = 11800 |
| 20) | 94 * 138 - 94 * 38 = | | 20) ( 138 - 38) * 94 = 9400 |
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Score: ______________ | |
