Subtract 35/40 from 21/8
1st number: 2 5/8, 2nd number: 35/40
21/8 - 35/40 is 7/4.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 40 is 40
Next, find the equivalent fraction of both fractional numbers with denominator 40 - For the 1st fraction, since 8 × 5 = 40,
21/8 = 21 × 5/8 × 5 = 105/40 - Likewise, for the 2nd fraction, since 40 × 1 = 40,
35/40 = 35 × 1/40 × 1 = 35/40 - Subtract the two like fractions:
105/40 - 35/40 = 105 - 35/40 = 70/40 - After reducing the fraction, the answer is 7/4
- In mixed form: 13/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/8-35/40 21/8-70/40 21/16-35/40 21/8-35/80 63/8-35/40 21/24-35/40 21/40-35/40 21/56-35/40