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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Wednesday July 15 2026
06:56:03 AM | Wednesday July 15 2026
06:56:03 AMFlip Answers |
| 1) | 108 * 92 = | | 1) 100 * 100 - 8 * 8 = 9936 |
| 2) | 403 * 397 = | | 2) 400 * 400 - 3 * 3 = 159991 |
| 3) | 407 * 393 = | | 3) 400 * 400 - 7 * 7 = 159951 |
| 4) | 199 * 201 = | | 4) 200 * 200 - 1 * 1 = 39999 |
| 5) | 103 * 97 = | | 5) 100 * 100 - 3 * 3 = 9991 |
| 6) | 305 * 295 = | | 6) 300 * 300 - 5 * 5 = 89975 |
| 7) | 302 * 298 = | | 7) 300 * 300 - 2 * 2 = 89996 |
| 8) | 199 * 201 = | | 8) 200 * 200 - 1 * 1 = 39999 |
| 9) | 95 * 105 = | | 9) 100 * 100 - 5 * 5 = 9975 |
| 10) | 109 * 91 = | | 10) 100 * 100 - 9 * 9 = 9919 |
| 11) | 97 * 247 - 97 * 47 = | | 11) ( 247 - 47) * 97 = 19400 |
| 12) | 58 * 64 + 36 * 58 = | | 12) ( 36 + 64) * 58 = 5800 |
| 13) | 27 * 274 - 27 * 74 = | | 13) ( 274 - 74) * 27 = 5400 |
| 14) | 148 * 74 - 48 * 74 = | | 14) ( 148 - 48) * 74 = 7400 |
| 15) | 273 * 35 - 35 * 73 = | | 15) ( 273 - 73) * 35 = 7000 |
| 16) | 40 * 45 + 60 * 45 = | | 16) ( 60 + 40) * 45 = 4500 |
| 17) | 242 * 84 - 42 * 84 = | | 17) ( 242 - 42) * 84 = 16800 |
| 18) | 273 * 29 - 73 * 29 = | | 18) ( 273 - 73) * 29 = 5800 |
| 19) | 71 * 56 + 29 * 56 = | | 19) ( 29 + 71) * 56 = 5600 |
| 20) | 71 * 28 + 72 * 71 = | | 20) ( 28 + 72) * 71 = 7100 |
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Score: ______________ | |
