Add 21/40 and 30/50
21/40 + 30/50 is 9/8.
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,
30/50 = 30 × 4/50 × 4 = 120/200 - Add the two like fractions:
105/200 + 120/200 = 105 + 120/200 = 225/200 - 225/200 simplified gives 9/8
- So, 21/40 + 30/50 = 9/8
In mixed form: 11/8
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/40+30/50 21/40+60/50 21/80+30/50 63/40+30/50 21/40+90/50