Add 27/90 and 70/80
27/90 + 70/80 is 47/40.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 80 is 720
Next, find the equivalent fraction of both fractional numbers with denominator 720 - For the 1st fraction, since 90 × 8 = 720,
27/90 = 27 × 8/90 × 8 = 216/720 - Likewise, for the 2nd fraction, since 80 × 9 = 720,
70/80 = 70 × 9/80 × 9 = 630/720 - Add the two like fractions:
216/720 + 630/720 = 216 + 630/720 = 846/720 - 846/720 simplified gives 47/40
- So, 27/90 + 70/80 = 47/40
In mixed form: 17/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/90+70/80 81/90+70/80