Subtract 3/45 from 21/48
21/48 - 3/45 is 89/240.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 48 and 45 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 45 × 16 = 720,
3/45 = 3 × 16/45 × 16 = 48/720 - Subtract the two like fractions:
315/720 - 48/720 = 315 - 48/720 = 267/720 - After reducing the fraction, the answer is 89/240
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/48-3/45 21/48-6/45 21/96-3/45 21/48-3/90 63/48-3/45 21/48-9/45 21/48-15/45 21/48-21/45