Add 28/40 and 21/48
28/40 + 21/48 is 91/80.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 48 is 240
Next, find the equivalent fraction of both fractional numbers with denominator 240 - For the 1st fraction, since 40 × 6 = 240,
28/40 = 28 × 6/40 × 6 = 168/240 - Likewise, for the 2nd fraction, since 48 × 5 = 240,
21/48 = 21 × 5/48 × 5 = 105/240 - Add the two like fractions:
168/240 + 105/240 = 168 + 105/240 = 273/240 - 273/240 simplified gives 91/80
- So, 28/40 + 21/48 = 91/80
In mixed form: 111/80
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/40+21/48 28/40+42/48 28/80+21/48 28/40+21/96 84/40+21/48 28/40+63/48