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On the number line, (3\frac{1}{2}) is equal to which decimal?

Answer and explanation

Correct answer: (3.5)

The direct answer is A: \(3\frac12=3.5\). A mixed number contains a whole-number part and a fractional part. Here the whole part is 3 and the fraction is \(\frac12\). Since \(\frac12=0.5\), add them: \(3+0.5=3.5\). Therefore the number has the same position on the number line as 3.5. Option A is correct. Option B, 3.2, would mean adding only 0.2 to 3, not one-half. Option C, 2.5, is smaller by 1 and would correspond to \(2\frac12\). Option D, 4.5, is larger by 1 and would correspond to \(4\frac12\). Another method is to convert the mixed number to an improper fraction: \(3\frac12=\frac{3\times2+1}{2}=\frac72=3.5\). Memory cue: one-half always equals 0.5.

Related tags

Mixed-NumbersDecimalsNumber-Line

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