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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Friday April 26 2024
03:55:18 AM | Friday April 26 2024
03:55:18 AMFlip Answers |
| 1) | 197 * 203 = | | 1) 200 * 200 - 3 * 3 = 39991 |
| 2) | 190 * 210 = | | 2) 200 * 200 - 10 * 10 = 39900 |
| 3) | 397 * 403 = | | 3) 400 * 400 - 3 * 3 = 159991 |
| 4) | 293 * 307 = | | 4) 300 * 300 - 7 * 7 = 89951 |
| 5) | 306 * 294 = | | 5) 300 * 300 - 6 * 6 = 89964 |
| 6) | 291 * 309 = | | 6) 300 * 300 - 9 * 9 = 89919 |
| 7) | 107 * 93 = | | 7) 100 * 100 - 7 * 7 = 9951 |
| 8) | 198 * 202 = | | 8) 200 * 200 - 2 * 2 = 39996 |
| 9) | 396 * 404 = | | 9) 400 * 400 - 4 * 4 = 159984 |
| 10) | 193 * 207 = | | 10) 200 * 200 - 7 * 7 = 39951 |
| 11) | 149 * 58 - 49 * 58 = | | 11) ( 149 - 49) * 58 = 5800 |
| 12) | 21 * 273 - 21 * 73 = | | 12) ( 273 - 73) * 21 = 4200 |
| 13) | 46 * 48 + 46 * 52 = | | 13) ( 48 + 52) * 46 = 4600 |
| 14) | 85 * 240 - 40 * 85 = | | 14) ( 240 - 40) * 85 = 17000 |
| 15) | 166 * 79 - 66 * 79 = | | 15) ( 166 - 66) * 79 = 7900 |
| 16) | 44 * 56 + 56 * 56 = | | 16) ( 44 + 56) * 56 = 5600 |
| 17) | 162 * 91 - 91 * 62 = | | 17) ( 162 - 62) * 91 = 9100 |
| 18) | 146 * 88 + 54 * 88 = | | 18) ( 146 + 54) * 88 = 17600 |
| 19) | 52 * 248 - 52 * 48 = | | 19) ( 248 - 48) * 52 = 10400 |
| 20) | 39 * 52 + 39 * 48 = | | 20) ( 52 + 48) * 39 = 3900 |
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Score: ______________ | |
