Subtract 54/72 from 21/20
1st number: 1 1/20, 2nd number: 54/72
21/20 - 54/72 is 3/10.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 72 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 20 × 18 = 360,
21/20 = 21 × 18/20 × 18 = 378/360 - Likewise, for the 2nd fraction, since 72 × 5 = 360,
54/72 = 54 × 5/72 × 5 = 270/360 - Subtract the two like fractions:
378/360 - 270/360 = 378 - 270/360 = 108/360 - After reducing the fraction, the answer is 3/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/20-54/72 21/40-54/72 63/20-54/72 21/60-54/72