Subtract 21/90 from 90/48
1st number: 1 42/48, 2nd number: 21/90
90/48 - 21/90 is 197/120.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 48 and 90 is 720
Next, find the equivalent fraction of both fractional numbers with denominator 720 - For the 1st fraction, since 48 × 15 = 720,
90/48 = 90 × 15/48 × 15 = 1350/720 - Likewise, for the 2nd fraction, since 90 × 8 = 720,
21/90 = 21 × 8/90 × 8 = 168/720 - Subtract the two like fractions:
1350/720 - 168/720 = 1350 - 168/720 = 1182/720 - After reducing the fraction, the answer is 197/120
- In mixed form: 177/120
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/48-42/90 90/96-21/90 90/48-63/90