Subtract 49/81 from 63/42
1st number: 1 21/42, 2nd number: 49/81
63/42 - 49/81 is 145/162.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 81 is 1134
Next, find the equivalent fraction of both fractional numbers with denominator 1134 - For the 1st fraction, since 42 × 27 = 1134,
63/42 = 63 × 27/42 × 27 = 1701/1134 - Likewise, for the 2nd fraction, since 81 × 14 = 1134,
49/81 = 49 × 14/81 × 14 = 686/1134 - Subtract the two like fractions:
1701/1134 - 686/1134 = 1701 - 686/1134 = 1015/1134 - After reducing the fraction, the answer is 145/162
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 63/42-98/81 63/84-49/81