Add 81/20 and 28/40
1st number: 4 1/20, 2nd number: 28/40
81/20 + 28/40 is 19/4.
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,
28/40 = 28 × 1/40 × 1 = 28/40 - Add the two like fractions:
162/40 + 28/40 = 162 + 28/40 = 190/40 - 190/40 simplified gives 19/4
- So, 81/20 + 28/40 = 19/4
In mixed form: 43/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/20+56/40 81/40+28/40 81/20+28/80 81/20+84/40 81/60+28/40