Add 20/54 and 70/90
20/54 + 70/90 is 31/27.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 54 and 90 is 270
Next, find the equivalent fraction of both fractional numbers with denominator 270 - For the 1st fraction, since 54 × 5 = 270,
20/54 = 20 × 5/54 × 5 = 100/270 - Likewise, for the 2nd fraction, since 90 × 3 = 270,
70/90 = 70 × 3/90 × 3 = 210/270 - Add the two like fractions:
100/270 + 210/270 = 100 + 210/270 = 310/270 - 310/270 simplified gives 31/27
- So, 20/54 + 70/90 = 31/27
In mixed form: 14/27
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/54+70/90 60/54+70/90