Add 72/60 and 4/21
1st number: 1 12/60, 2nd number: 4/21
72/60 + 4/21 is 146/105.
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,
4/21 = 4 × 20/21 × 20 = 80/420 - Add the two like fractions:
504/420 + 80/420 = 504 + 80/420 = 584/420 - 584/420 simplified gives 146/105
- So, 72/60 + 4/21 = 146/105
In mixed form: 141/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/60+8/21 72/60+4/42 72/60+12/21 72/60+4/63 72/60+20/21 72/60+28/21