Add 21/40 and 28/60
21/40 + 28/60 is 119/120.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 60 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 40 × 3 = 120,
21/40 = 21 × 3/40 × 3 = 63/120 - Likewise, for the 2nd fraction, since 60 × 2 = 120,
28/60 = 28 × 2/60 × 2 = 56/120 - Add the two like fractions:
63/120 + 56/120 = 63 + 56/120 = 119/120 - So, 21/40 + 28/60 = 119/120
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/40+28/60 21/40+56/60 21/80+28/60 63/40+28/60 21/40+84/60