Subtract 45/81 from 21/35
21/35 - 45/81 is 2/45.
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,
21/35 = 21 × 81/35 × 81 = 1701/2835 - Likewise, for the 2nd fraction, since 81 × 35 = 2835,
45/81 = 45 × 35/81 × 35 = 1575/2835 - Subtract the two like fractions:
1701/2835 - 1575/2835 = 1701 - 1575/2835 = 126/2835 - After reducing the fraction, the answer is 2/45
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/35-45/81 21/35-90/81 21/70-45/81 63/35-45/81