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First you should know 15/4 is an improper fraction.

You should know you can make a whole because 15,the numerator,is bigger than 4 so therefore you can make another whole.You can make 3 more wholes because 4x3=12 .So now you add 3+15 which is 18 and now for the fraction 3/4.

18 3/4

15.4 seconds becomes 15 and 4/10 or 15 and 2/5 (fifteen and two-fifths of a second).

(Also 15/4 = 3 and 3/4 but I know that was not the question).

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12y ago
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Q: How do you change 15.4 seconds into a mixed number?
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