Subtract 2/8 from 21/5
1st number: 4 1/5, 2nd number: 2/8
21/5 - 2/8 is 79/20.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 5 and 8 is 40
Next, find the equivalent fraction of both fractional numbers with denominator 40 - For the 1st fraction, since 5 × 8 = 40,
21/5 = 21 × 8/5 × 8 = 168/40 - Likewise, for the 2nd fraction, since 8 × 5 = 40,
2/8 = 2 × 5/8 × 5 = 10/40 - Subtract the two like fractions:
168/40 - 10/40 = 168 - 10/40 = 158/40 - After reducing the fraction, the answer is 79/20
- In mixed form: 319/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/5-2/8 21/5-4/8 21/10-2/8 21/5-2/16 63/5-2/8 21/5-6/8 21/15-2/8 21/5-2/24 21/5-10/8 21/25-2/8 21/5-2/40 21/5-14/8 21/35-2/8 21/5-2/56