Subtract 90/81 from 2/42
1st number: 2/42, 2nd number: 1 9/81
2/42 - 90/81 is -67/63.
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,
2/42 = 2 × 27/42 × 27 = 54/1134 - Likewise, for the 2nd fraction, since 81 × 14 = 1134,
90/81 = 90 × 14/81 × 14 = 1260/1134 - Subtract the two like fractions:
54/1134 - 1260/1134 = 54 - 1260/1134 = -1206/1134 - After reducing the fraction, the answer is -67/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 4/42-90/81 2/84-90/81 6/42-90/81 10/42-90/81 14/42-90/81