Subtract 48/45 from 21/84
1st number: 21/84, 2nd number: 1 3/45
21/84 - 48/45 is -49/60.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 45 is 1260
Next, find the equivalent fraction of both fractional numbers with denominator 1260 - For the 1st fraction, since 84 × 15 = 1260,
21/84 = 21 × 15/84 × 15 = 315/1260 - Likewise, for the 2nd fraction, since 45 × 28 = 1260,
48/45 = 48 × 28/45 × 28 = 1344/1260 - Subtract the two like fractions:
315/1260 - 1344/1260 = 315 - 1344/1260 = -1029/1260 - After reducing the fraction, the answer is -49/60
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/84-48/45 21/84-96/45 21/84-48/90 63/84-48/45