Difficulty: Easy
Correct Answer: 512
Explanation:
Introduction / Context:This is a direct division problem presented as a missing factor question. Solving requires rearranging to N = 62976 / 123 and computing the quotient accurately. Recognizing powers of two may speed up checking the candidate options.
Given Data / Assumptions:
Concept / Approach:Rearrange the relation to isolate N. Then compute the division or check by multiplication with candidate options. Since 512 is a familiar power of two (2^9), quickly testing 123 * 512 is efficient.
Step-by-Step Solution:
Rearrange: N = 62976 / 123.Test 512: 123 * 512 = 123 * (500 + 12) = 61500 + 1476 = 62976.Therefore, N = 512 exactly.Verification / Alternative check:Perform long division 62976 ÷ 123 to confirm the quotient 512 with no remainder. This validates the selection.
Why Other Options Are Wrong:412, 502, and 522 do not produce 62976 when multiplied by 123. 123 would imply 123 * 123 = 15129, which is far too small.
Common Pitfalls:Arithmetic slips in multiplication or assuming that the divisor must be near 123. Using estimation helps but should be confirmed by exact multiplication.
Final Answer:512
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