Subtract 9/90 from 21/48
21/48 - 9/90 is 27/80.
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,
21/48 = 21 × 15/48 × 15 = 315/720 - Likewise, for the 2nd fraction, since 90 × 8 = 720,
9/90 = 9 × 8/90 × 8 = 72/720 - Subtract the two like fractions:
315/720 - 72/720 = 315 - 72/720 = 243/720 - After reducing the fraction, the answer is 27/80
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/48-9/90 21/48-18/90 21/96-9/90 63/48-9/90 21/48-27/90 21/48-45/90 21/48-63/90