Add 1/5 and 81/20
1st number: 1/5, 2nd number: 4 1/20
1/5 + 81/20 is 17/4.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 5 and 20 is 20
Next, find the equivalent fraction of both fractional numbers with denominator 20 - For the 1st fraction, since 5 × 4 = 20,
1/5 = 1 × 4/5 × 4 = 4/20 - Likewise, for the 2nd fraction, since 20 × 1 = 20,
81/20 = 81 × 1/20 × 1 = 81/20 - Add the two like fractions:
4/20 + 81/20 = 4 + 81/20 = 85/20 - 85/20 simplified gives 17/4
- So, 1/5 + 81/20 = 17/4
In mixed form: 41/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/5+81/20 1/10+81/20 1/5+81/40 3/5+81/20 1/15+81/20 1/5+81/60 1/25+81/20 7/5+81/20 1/35+81/20