Add 81/48 and 20/90
1st number: 1 33/48, 2nd number: 20/90
81/48 + 20/90 is 275/144.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 48 and 90 is 720
Next, find the equivalent fraction of both fractional numbers with denominator 720 - For the 1st fraction, since 48 × 15 = 720,
81/48 = 81 × 15/48 × 15 = 1215/720 - Likewise, for the 2nd fraction, since 90 × 8 = 720,
20/90 = 20 × 8/90 × 8 = 160/720 - Add the two like fractions:
1215/720 + 160/720 = 1215 + 160/720 = 1375/720 - 1375/720 simplified gives 275/144
- So, 81/48 + 20/90 = 275/144
In mixed form: 1131/144
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/48+40/90 81/96+20/90 81/48+60/90