Add 81/20 and 42/40
1st number: 4 1/20, 2nd number: 1 2/40
81/20 + 42/40 is 51/10.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 40 is 40
Next, find the equivalent fraction of both fractional numbers with denominator 40 - For the 1st fraction, since 20 × 2 = 40,
81/20 = 81 × 2/20 × 2 = 162/40 - Likewise, for the 2nd fraction, since 40 × 1 = 40,
42/40 = 42 × 1/40 × 1 = 42/40 - Add the two like fractions:
162/40 + 42/40 = 162 + 42/40 = 204/40 - 204/40 simplified gives 51/10
- So, 81/20 + 42/40 = 51/10
In mixed form: 51/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/20+84/40 81/40+42/40 81/20+42/80 81/60+42/40