Add 18/15 and 20/72
1st number: 1 3/15, 2nd number: 20/72
18/15 + 20/72 is 133/90.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 72 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 15 × 24 = 360,
18/15 = 18 × 24/15 × 24 = 432/360 - Likewise, for the 2nd fraction, since 72 × 5 = 360,
20/72 = 20 × 5/72 × 5 = 100/360 - Add the two like fractions:
432/360 + 100/360 = 432 + 100/360 = 532/360 - 532/360 simplified gives 133/90
- So, 18/15 + 20/72 = 133/90
In mixed form: 143/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/15+20/72 18/15+40/72 18/30+20/72 54/15+20/72 18/15+60/72 18/45+20/72 90/15+20/72 18/75+20/72