Subtract 30/81 from 7/35
7/35 - 30/81 is -23/135.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 35 and 81 is 2835
Next, find the equivalent fraction of both fractional numbers with denominator 2835 - For the 1st fraction, since 35 × 81 = 2835,
7/35 = 7 × 81/35 × 81 = 567/2835 - Likewise, for the 2nd fraction, since 81 × 35 = 2835,
30/81 = 30 × 35/81 × 35 = 1050/2835 - Subtract the two like fractions:
567/2835 - 1050/2835 = 567 - 1050/2835 = -483/2835 - After reducing the fraction, the answer is -23/135
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/35-30/81 7/35-60/81 7/70-30/81 21/35-30/81 7/35-90/81 49/35-30/81