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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Thursday January 22 2026
03:39:13 AM | Thursday January 22 2026
03:39:13 AMFlip Answers |
| 1) | 404 * 396 = | | 1) 400 * 400 - 4 * 4 = 159984 |
| 2) | 407 * 393 = | | 2) 400 * 400 - 7 * 7 = 159951 |
| 3) | 402 * 398 = | | 3) 400 * 400 - 2 * 2 = 159996 |
| 4) | 402 * 398 = | | 4) 400 * 400 - 2 * 2 = 159996 |
| 5) | 99 * 101 = | | 5) 100 * 100 - 1 * 1 = 9999 |
| 6) | 306 * 294 = | | 6) 300 * 300 - 6 * 6 = 89964 |
| 7) | 197 * 203 = | | 7) 200 * 200 - 3 * 3 = 39991 |
| 8) | 205 * 195 = | | 8) 200 * 200 - 5 * 5 = 39975 |
| 9) | 293 * 307 = | | 9) 300 * 300 - 7 * 7 = 89951 |
| 10) | 410 * 390 = | | 10) 400 * 400 - 10 * 10 = 159900 |
| 11) | 126 * 35 + 74 * 35 = | | 11) ( 126 + 74) * 35 = 7000 |
| 12) | 153 * 55 - 53 * 55 = | | 12) ( 153 - 53) * 55 = 5500 |
| 13) | 157 * 67 - 57 * 67 = | | 13) ( 157 - 57) * 67 = 6700 |
| 14) | 94 * 242 - 42 * 94 = | | 14) ( 242 - 42) * 94 = 18800 |
| 15) | 69 * 70 + 131 * 70 = | | 15) ( 131 + 69) * 70 = 14000 |
| 16) | 34 * 146 + 34 * 54 = | | 16) ( 146 + 54) * 34 = 6800 |
| 17) | 158 * 97 + 42 * 97 = | | 17) ( 158 + 42) * 97 = 19400 |
| 18) | 173 * 44 - 44 * 73 = | | 18) ( 173 - 73) * 44 = 4400 |
| 19) | 66 * 156 - 66 * 56 = | | 19) ( 156 - 56) * 66 = 6600 |
| 20) | 75 * 55 + 125 * 55 = | | 20) ( 125 + 75) * 55 = 11000 |
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Score: ______________ | |
