Add 42/48 and 21/80
42/48 + 21/80 is 91/80.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 48 and 80 is 240
Next, find the equivalent fraction of both fractional numbers with denominator 240 - For the 1st fraction, since 48 × 5 = 240,
42/48 = 42 × 5/48 × 5 = 210/240 - Likewise, for the 2nd fraction, since 80 × 3 = 240,
21/80 = 21 × 3/80 × 3 = 63/240 - Add the two like fractions:
210/240 + 63/240 = 210 + 63/240 = 273/240 - 273/240 simplified gives 91/80
- So, 42/48 + 21/80 = 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: 84/48+21/80 42/48+42/80 42/96+21/80 42/48+63/80