SSAT Math Question 245: Answer and Explanation
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Question: 245
9. To simplify the expression 
, each fraction must have a denominator of
- A. 2
- B. 4
- C. 7
- D. 14
Correct Answer: E
Explanation:
The answer is E
This question is asking for the least common multiple. Break 4 into prime factors (2 and 7 are already prime): 2 and 2. Thus, the least common multiple must include 2, 2, and 7. The result is 28.
You can list out multiples of all three numbers, but you will quickly see that this is time consuming. You can also test the answers to see which one or ones have 2, 4, and 7 as factors. Only choice (E) does.