Add 60/72 and 40/21
1st number: 60/72, 2nd number: 1 19/21
60/72 + 40/21 is 115/42.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 72 and 21 is 504
Next, find the equivalent fraction of both fractional numbers with denominator 504 - For the 1st fraction, since 72 × 7 = 504,
60/72 = 60 × 7/72 × 7 = 420/504 - Likewise, for the 2nd fraction, since 21 × 24 = 504,
40/21 = 40 × 24/21 × 24 = 960/504 - Add the two like fractions:
420/504 + 960/504 = 420 + 960/504 = 1380/504 - 1380/504 simplified gives 115/42
- So, 60/72 + 40/21 = 115/42
In mixed form: 231/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/72+80/21 60/72+40/42 60/72+40/63