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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Tuesday September 22 2026
09:53:58 PM | Tuesday September 22 2026
09:53:58 PMFlip Answers |
| 1) | 203 * 197 = | | 1) 200 * 200 - 3 * 3 = 39991 |
| 2) | 196 * 204 = | | 2) 200 * 200 - 4 * 4 = 39984 |
| 3) | 308 * 292 = | | 3) 300 * 300 - 8 * 8 = 89936 |
| 4) | 302 * 298 = | | 4) 300 * 300 - 2 * 2 = 89996 |
| 5) | 107 * 93 = | | 5) 100 * 100 - 7 * 7 = 9951 |
| 6) | 303 * 297 = | | 6) 300 * 300 - 3 * 3 = 89991 |
| 7) | 201 * 199 = | | 7) 200 * 200 - 1 * 1 = 39999 |
| 8) | 191 * 209 = | | 8) 200 * 200 - 9 * 9 = 39919 |
| 9) | 295 * 305 = | | 9) 300 * 300 - 5 * 5 = 89975 |
| 10) | 299 * 301 = | | 10) 300 * 300 - 1 * 1 = 89999 |
| 11) | 75 * 48 + 48 * 125 = | | 11) ( 125 + 75) * 48 = 9600 |
| 12) | 45 * 86 + 155 * 86 = | | 12) ( 155 + 45) * 86 = 17200 |
| 13) | 61 * 87 + 87 * 139 = | | 13) ( 139 + 61) * 87 = 17400 |
| 14) | 81 * 169 - 69 * 81 = | | 14) ( 169 - 69) * 81 = 8100 |
| 15) | 38 * 45 + 55 * 38 = | | 15) ( 45 + 55) * 38 = 3800 |
| 16) | 46 * 79 + 79 * 54 = | | 16) ( 54 + 46) * 79 = 7900 |
| 17) | 93 * 52 + 93 * 48 = | | 17) ( 48 + 52) * 93 = 9300 |
| 18) | 68 * 47 + 68 * 153 = | | 18) ( 153 + 47) * 68 = 13600 |
| 19) | 58 * 126 + 58 * 74 = | | 19) ( 126 + 74) * 58 = 11600 |
| 20) | 145 * 40 - 45 * 40 = | | 20) ( 145 - 45) * 40 = 4000 |
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Score: ______________ | |
