Add 21/40 and 54/60
21/40 + 54/60 is 57/40.
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,
54/60 = 54 × 2/60 × 2 = 108/120 - Add the two like fractions:
63/120 + 108/120 = 63 + 108/120 = 171/120 - 171/120 simplified gives 57/40
- So, 21/40 + 54/60 = 57/40
In mixed form: 117/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/40+54/60 21/80+54/60 63/40+54/60