Subtract 20/8 from 81/10
1st number: 8 1/10, 2nd number: 2 4/8
81/10 - 20/8 is 28/5.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 10 and 8 is 40
Next, find the equivalent fraction of both fractional numbers with denominator 40 - For the 1st fraction, since 10 × 4 = 40,
81/10 = 81 × 4/10 × 4 = 324/40 - Likewise, for the 2nd fraction, since 8 × 5 = 40,
20/8 = 20 × 5/8 × 5 = 100/40 - Subtract the two like fractions:
324/40 - 100/40 = 324 - 100/40 = 224/40 - After reducing the fraction, the answer is 28/5
- In mixed form: 53/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/10-40/8 81/20-20/8 81/10-20/16 81/10-60/8 81/30-20/8 81/10-20/24 81/50-20/8 81/10-20/40 81/70-20/8 81/10-20/56