Add 21/30 and 40/20
1st number: 21/30, 2nd number: 2 0/20
21/30 + 40/20 is 27/10.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 20 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 20 × 3 = 60,
40/20 = 40 × 3/20 × 3 = 120/60 - Add the two like fractions:
42/60 + 120/60 = 42 + 120/60 = 162/60 - 162/60 simplified gives 27/10
- So, 21/30 + 40/20 = 27/10
In mixed form: 27/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/30+40/20 21/30+80/20 21/60+40/20 63/30+40/20 21/90+40/20 21/30+40/60