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 May 28 2026
12:05:00 AM | Thursday May 28 2026
12:05:00 AMFlip Answers |
| 1) | 198 * 202 = | | 1) 200 * 200 - 2 * 2 = 39996 |
| 2) | 207 * 193 = | | 2) 200 * 200 - 7 * 7 = 39951 |
| 3) | 295 * 305 = | | 3) 300 * 300 - 5 * 5 = 89975 |
| 4) | 308 * 292 = | | 4) 300 * 300 - 8 * 8 = 89936 |
| 5) | 194 * 206 = | | 5) 200 * 200 - 6 * 6 = 39964 |
| 6) | 403 * 397 = | | 6) 400 * 400 - 3 * 3 = 159991 |
| 7) | 301 * 299 = | | 7) 300 * 300 - 1 * 1 = 89999 |
| 8) | 109 * 91 = | | 8) 100 * 100 - 9 * 9 = 9919 |
| 9) | 298 * 302 = | | 9) 300 * 300 - 2 * 2 = 89996 |
| 10) | 110 * 90 = | | 10) 100 * 100 - 10 * 10 = 9900 |
| 11) | 46 * 152 + 48 * 46 = | | 11) ( 152 + 48) * 46 = 9200 |
| 12) | 38 * 57 + 57 * 162 = | | 12) ( 162 + 38) * 57 = 11400 |
| 13) | 21 * 274 - 21 * 74 = | | 13) ( 274 - 74) * 21 = 4200 |
| 14) | 35 * 144 - 44 * 35 = | | 14) ( 144 - 44) * 35 = 3500 |
| 15) | 25 * 261 - 25 * 61 = | | 15) ( 261 - 61) * 25 = 5000 |
| 16) | 90 * 37 + 90 * 63 = | | 16) ( 37 + 63) * 90 = 9000 |
| 17) | 137 * 57 - 37 * 57 = | | 17) ( 137 - 37) * 57 = 5700 |
| 18) | 70 * 32 + 32 * 30 = | | 18) ( 30 + 70) * 32 = 3200 |
| 19) | 38 * 50 + 50 * 62 = | | 19) ( 62 + 38) * 50 = 5000 |
| 20) | 52 * 56 + 44 * 52 = | | 20) ( 56 + 44) * 52 = 5200 |
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Score: ______________ | |
