Add 72/60 and 84/21
1st number: 1 12/60, 2nd number: 4 0/21
72/60 + 84/21 is 26/5.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 60 and 21 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 60 × 7 = 420,
72/60 = 72 × 7/60 × 7 = 504/420 - Likewise, for the 2nd fraction, since 21 × 20 = 420,
84/21 = 84 × 20/21 × 20 = 1680/420 - Add the two like fractions:
504/420 + 1680/420 = 504 + 1680/420 = 2184/420 - 2184/420 simplified gives 26/5
- So, 72/60 + 84/21 = 26/5
In mixed form: 51/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/60+84/42 72/60+84/63