Add 21/60 and 25/42
21/60 + 25/42 is 397/420.
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,
25/42 = 25 × 10/42 × 10 = 250/420 - Add the two like fractions:
147/420 + 250/420 = 147 + 250/420 = 397/420 - So, 21/60 + 25/42 = 397/420
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/60+25/42 21/60+50/42 21/60+25/84 63/60+25/42 21/60+75/42