Seven and one-half fifteenths (7.5 fifteenths).
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A bit more explanation:
15 ÷ 2 = 7.5
(Note: a fifteenth is the same as cutting a pie into 15 slices. So simply divide the whole pie by 2.)
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Seven and a half.
7.5/15 = 1/2, so there are 7.5 fifteenths in one half.
5
Two fifths is six fifteenths. Eleven fifteenths minus six fifteenths is five fifteenths, which is also one third.
12 fifteenths (sure?)19 fifteenths = 10 fifteenths (2/3) + 9 fifteenths (3/5)