Add 28/72 and 84/90
28/72 + 84/90 is 119/90.
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,
84/90 = 84 × 4/90 × 4 = 336/360 - Add the two like fractions:
140/360 + 336/360 = 140 + 336/360 = 476/360 - 476/360 simplified gives 119/90
- So, 28/72 + 84/90 = 119/90
In mixed form: 129/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/72+84/90 84/72+84/90