Add 18/21 and 72/60
1st number: 18/21, 2nd number: 1 12/60
18/21 + 72/60 is 72/35.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 60 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 21 × 20 = 420,
18/21 = 18 × 20/21 × 20 = 360/420 - Likewise, for the 2nd fraction, since 60 × 7 = 420,
72/60 = 72 × 7/60 × 7 = 504/420 - Add the two like fractions:
360/420 + 504/420 = 360 + 504/420 = 864/420 - 864/420 simplified gives 72/35
- So, 18/21 + 72/60 = 72/35
In mixed form: 22/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/21+72/60 18/42+72/60 54/21+72/60 18/63+72/60 90/21+72/60