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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Saturday September 13 2025
02:46:44 AM | Saturday September 13 2025
02:46:44 AMFlip Answers |
| 1) | 296 * 304 = | | 1) 300 * 300 - 4 * 4 = 89984 |
| 2) | 299 * 301 = | | 2) 300 * 300 - 1 * 1 = 89999 |
| 3) | 197 * 203 = | | 3) 200 * 200 - 3 * 3 = 39991 |
| 4) | 407 * 393 = | | 4) 400 * 400 - 7 * 7 = 159951 |
| 5) | 209 * 191 = | | 5) 200 * 200 - 9 * 9 = 39919 |
| 6) | 409 * 391 = | | 6) 400 * 400 - 9 * 9 = 159919 |
| 7) | 190 * 210 = | | 7) 200 * 200 - 10 * 10 = 39900 |
| 8) | 292 * 308 = | | 8) 300 * 300 - 8 * 8 = 89936 |
| 9) | 94 * 106 = | | 9) 100 * 100 - 6 * 6 = 9964 |
| 10) | 297 * 303 = | | 10) 300 * 300 - 3 * 3 = 89991 |
| 11) | 140 * 81 - 81 * 40 = | | 11) ( 140 - 40) * 81 = 8100 |
| 12) | 162 * 30 + 30 * 38 = | | 12) ( 162 + 38) * 30 = 6000 |
| 13) | 62 * 43 + 62 * 157 = | | 13) ( 157 + 43) * 62 = 12400 |
| 14) | 265 * 97 - 97 * 65 = | | 14) ( 265 - 65) * 97 = 19400 |
| 15) | 142 * 65 + 58 * 65 = | | 15) ( 142 + 58) * 65 = 13000 |
| 16) | 47 * 96 + 53 * 96 = | | 16) ( 47 + 53) * 96 = 9600 |
| 17) | 52 * 79 + 48 * 79 = | | 17) ( 48 + 52) * 79 = 7900 |
| 18) | 40 * 163 + 37 * 40 = | | 18) ( 163 + 37) * 40 = 8000 |
| 19) | 43 * 141 - 41 * 43 = | | 19) ( 141 - 41) * 43 = 4300 |
| 20) | 169 * 29 - 69 * 29 = | | 20) ( 169 - 69) * 29 = 2900 |
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Score: ______________ | |
