Add 81/21 and 60/42
1st number: 3 18/21, 2nd number: 1 18/42
81/21 + 60/42 is 37/7.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 42 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 21 × 2 = 42,
81/21 = 81 × 2/21 × 2 = 162/42 - Likewise, for the 2nd fraction, since 42 × 1 = 42,
60/42 = 60 × 1/42 × 1 = 60/42 - Add the two like fractions:
162/42 + 60/42 = 162 + 60/42 = 222/42 - 222/42 simplified gives 37/7
- So, 81/21 + 60/42 = 37/7
In mixed form: 52/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/42+60/42 81/21+60/84 81/63+60/42