Add 21/40 and 45/50
21/40 + 45/50 is 57/40.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 50 is 200
Next, find the equivalent fraction of both fractional numbers with denominator 200 - For the 1st fraction, since 40 × 5 = 200,
21/40 = 21 × 5/40 × 5 = 105/200 - Likewise, for the 2nd fraction, since 50 × 4 = 200,
45/50 = 45 × 4/50 × 4 = 180/200 - Add the two like fractions:
105/200 + 180/200 = 105 + 180/200 = 285/200 - 285/200 simplified gives 57/40
- So, 21/40 + 45/50 = 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+45/50 21/40+90/50 21/80+45/50 63/40+45/50