Subtract 18/63 from 27/21
1st number: 1 6/21, 2nd number: 18/63
27/21 - 18/63 is 1/1.
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,
27/21 = 27 × 3/21 × 3 = 81/63 - Likewise, for the 2nd fraction, since 63 × 1 = 63,
18/63 = 18 × 1/63 × 1 = 18/63 - Subtract the two like fractions:
81/63 - 18/63 = 81 - 18/63 = 63/63 - After reducing the fraction, the answer is 1/1
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/21-18/63 27/21-36/63 27/42-18/63 81/21-18/63 27/21-54/63 27/63-18/63 27/21-90/63