Add 21/60 and 30/42
21/60 + 30/42 is 149/140.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 60 and 42 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 60 × 7 = 420,
21/60 = 21 × 7/60 × 7 = 147/420 - Likewise, for the 2nd fraction, since 42 × 10 = 420,
30/42 = 30 × 10/42 × 10 = 300/420 - Add the two like fractions:
147/420 + 300/420 = 147 + 300/420 = 447/420 - 447/420 simplified gives 149/140
- So, 21/60 + 30/42 = 149/140
In mixed form: 19/140
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/60+30/42 21/60+60/42 21/60+30/84 63/60+30/42 21/60+90/42