Subtract 35/81 from 3/42
3/42 - 35/81 is -409/1134.
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,
3/42 = 3 × 27/42 × 27 = 81/1134 - Likewise, for the 2nd fraction, since 81 × 14 = 1134,
35/81 = 35 × 14/81 × 14 = 490/1134 - Subtract the two like fractions:
81/1134 - 490/1134 = 81 - 490/1134 = -409/1134
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/42-35/81 3/42-70/81 3/84-35/81 9/42-35/81 15/42-35/81 21/42-35/81