Add 28/72 and 7/90
28/72 + 7/90 is 7/15.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 72 and 90 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 72 × 5 = 360,
28/72 = 28 × 5/72 × 5 = 140/360 - Likewise, for the 2nd fraction, since 90 × 4 = 360,
7/90 = 7 × 4/90 × 4 = 28/360 - Add the two like fractions:
140/360 + 28/360 = 140 + 28/360 = 168/360 - 168/360 simplified gives 7/15
- So, 28/72 + 7/90 = 7/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/72+7/90 28/72+14/90 84/72+7/90 28/72+21/90 28/72+35/90 28/72+49/90