Subtract 49/63 from 81/21
1st number: 3 18/21, 2nd number: 49/63
81/21 - 49/63 is 194/63.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 63 is 63
Next, find the equivalent fraction of both fractional numbers with denominator 63 - For the 1st fraction, since 21 × 3 = 63,
81/21 = 81 × 3/21 × 3 = 243/63 - Likewise, for the 2nd fraction, since 63 × 1 = 63,
49/63 = 49 × 1/63 × 1 = 49/63 - Subtract the two like fractions:
243/63 - 49/63 = 243 - 49/63 = 194/63 - In mixed form: 35/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/21-98/63 81/42-49/63 81/63-49/63