Subtract 18/80 from 54/10, Solve 5 4/10

Subtract 18/80 from 54/10

1^st number: 5 4/10, 2^nd number: 18/80

54/10 - 18/80 is 207/40.

Find the least common denominator or LCM of the two denominators:
LCM of 10 and 80 is 80

Next, find the equivalent fraction of both fractional numbers with denominator 80
For the 1st fraction, since 10 × 8 = 80,
54/10 = 54 × 8/10 × 8 = 432/80
Likewise, for the 2nd fraction, since 80 × 1 = 80,
18/80 = 18 × 1/80 × 1 = 18/80
Subtract the two like fractions:
432/80 - 18/80 = 432 - 18/80 = 414/80
After reducing the fraction, the answer is 207/40
In mixed form: 57/40

MathStep (Works offline)

Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad