What is a half as a fraction and what is four fifths of 20?
A half is one divided by two. As a fraction we call this one over two and write it 1/2 or
1
–
2
Four fifths of 20 is
4
– × 20 = (4 × 20) ÷ 5 = 80 ÷ 5 = 16
5
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Last updated: 27 September, 2007.