Add 72/60 and 40/21
1st number: 1 12/60, 2nd number: 1 19/21
72/60 + 40/21 is 326/105.
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,
40/21 = 40 × 20/21 × 20 = 800/420 - Add the two like fractions:
504/420 + 800/420 = 504 + 800/420 = 1304/420 - 1304/420 simplified gives 326/105
- So, 72/60 + 40/21 = 326/105
In mixed form: 311/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/60+80/21 72/60+40/42 72/60+40/63