and , both rounded to 1 decimal place. Which calculation gives the upper bound of ?
Answer and explanation
Correct answer: D.
- Step 1: To make a fraction as large as possible, use the largest numerator and the smallest denominator.
- Step 2: The largest value below 6.4 rounded is 6.45 and the smallest value that rounds to 2.5 is 2.45.
- Step 3: So the upper bound is (about 2.633).
Answer
.
Why not the others: uses the largest denominator, uses the smallest numerator, and leaves the denominator unchanged.
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