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 April 13 2026
04:59:19 PM | Monday April 13 2026
04:59:19 PMFlip Answers |
| 1) | 191 * 209 = | | 1) 200 * 200 - 9 * 9 = 39919 |
| 2) | 199 * 201 = | | 2) 200 * 200 - 1 * 1 = 39999 |
| 3) | 295 * 305 = | | 3) 300 * 300 - 5 * 5 = 89975 |
| 4) | 392 * 408 = | | 4) 400 * 400 - 8 * 8 = 159936 |
| 5) | 203 * 197 = | | 5) 200 * 200 - 3 * 3 = 39991 |
| 6) | 195 * 205 = | | 6) 200 * 200 - 5 * 5 = 39975 |
| 7) | 106 * 94 = | | 7) 100 * 100 - 6 * 6 = 9964 |
| 8) | 297 * 303 = | | 8) 300 * 300 - 3 * 3 = 89991 |
| 9) | 406 * 394 = | | 9) 400 * 400 - 6 * 6 = 159964 |
| 10) | 203 * 197 = | | 10) 200 * 200 - 3 * 3 = 39991 |
| 11) | 56 * 37 + 56 * 63 = | | 11) ( 37 + 63) * 56 = 5600 |
| 12) | 149 * 87 + 87 * 51 = | | 12) ( 149 + 51) * 87 = 17400 |
| 13) | 91 * 127 + 91 * 73 = | | 13) ( 127 + 73) * 91 = 18200 |
| 14) | 49 * 22 + 22 * 51 = | | 14) ( 49 + 51) * 22 = 2200 |
| 15) | 137 * 91 - 37 * 91 = | | 15) ( 137 - 37) * 91 = 9100 |
| 16) | 57 * 168 - 68 * 57 = | | 16) ( 168 - 68) * 57 = 5700 |
| 17) | 60 * 151 + 49 * 60 = | | 17) ( 151 + 49) * 60 = 12000 |
| 18) | 96 * 169 - 96 * 69 = | | 18) ( 169 - 69) * 96 = 9600 |
| 19) | 268 * 25 - 68 * 25 = | | 19) ( 268 - 68) * 25 = 5000 |
| 20) | 22 * 48 + 22 * 152 = | | 20) ( 152 + 48) * 22 = 4400 |
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Score: ______________ | |
