Add 72/18 and 60/40
1st number: 4 0/18, 2nd number: 1 20/40
72/18 + 60/40 is 11/2.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 40 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 18 × 20 = 360,
72/18 = 72 × 20/18 × 20 = 1440/360 - Likewise, for the 2nd fraction, since 40 × 9 = 360,
60/40 = 60 × 9/40 × 9 = 540/360 - Add the two like fractions:
1440/360 + 540/360 = 1440 + 540/360 = 1980/360 - 1980/360 simplified gives 11/2
- So, 72/18 + 60/40 = 11/2
In mixed form: 51/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/36+60/40 72/18+60/80 72/54+60/40 72/90+60/40