Add 80/42 and 21/60
1st number: 1 38/42, 2nd number: 21/60
80/42 + 21/60 is 947/420.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 60 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 42 × 10 = 420,
80/42 = 80 × 10/42 × 10 = 800/420 - Likewise, for the 2nd fraction, since 60 × 7 = 420,
21/60 = 21 × 7/60 × 7 = 147/420 - Add the two like fractions:
800/420 + 147/420 = 800 + 147/420 = 947/420 - So, 80/42 + 21/60 = 947/420
In mixed form: 2107/420
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/42+42/60 80/84+21/60 80/42+63/60