Subtract 4/50 from 21/18, Solve 1 3/18

Subtract 4/50 from 21/18

1^st number: 1 3/18, 2^nd number: 4/50

21/18 - 4/50 is 163/150.

Find the least common denominator or LCM of the two denominators:
LCM of 18 and 50 is 450

Next, find the equivalent fraction of both fractional numbers with denominator 450
For the 1st fraction, since 18 × 25 = 450,
21/18 = 21 × 25/18 × 25 = 525/450
Likewise, for the 2nd fraction, since 50 × 9 = 450,
4/50 = 4 × 9/50 × 9 = 36/450
Subtract the two like fractions:
525/450 - 36/450 = 525 - 36/450 = 489/450
After reducing the fraction, the answer is 163/150
In mixed form: 113/150

MathStep (Works offline)

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