Add 28/72 and 18/30
28/72 + 18/30 is 89/90.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 72 and 30 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 30 × 12 = 360,
18/30 = 18 × 12/30 × 12 = 216/360 - Add the two like fractions:
140/360 + 216/360 = 140 + 216/360 = 356/360 - 356/360 simplified gives 89/90
- So, 28/72 + 18/30 = 89/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/72+18/30 28/72+36/30 28/72+18/60 84/72+18/30 28/72+54/30 28/72+18/90 28/72+90/30