Add 21/30 and 15/60
21/30 + 15/60 is 19/20.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 60 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 30 × 2 = 60,
21/30 = 21 × 2/30 × 2 = 42/60 - Likewise, for the 2nd fraction, since 60 × 1 = 60,
15/60 = 15 × 1/60 × 1 = 15/60 - Add the two like fractions:
42/60 + 15/60 = 42 + 15/60 = 57/60 - 57/60 simplified gives 19/20
- So, 21/30 + 15/60 = 19/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/30+15/60 21/30+30/60 21/60+15/60 63/30+15/60 21/30+45/60 21/90+15/60 21/30+75/60