Add 21/20 and 20/12
1st number: 1 1/20, 2nd number: 1 8/12
21/20 + 20/12 is 163/60.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 12 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 20 × 3 = 60,
21/20 = 21 × 3/20 × 3 = 63/60 - Likewise, for the 2nd fraction, since 12 × 5 = 60,
20/12 = 20 × 5/12 × 5 = 100/60 - Add the two like fractions:
63/60 + 100/60 = 63 + 100/60 = 163/60 - So, 21/20 + 20/12 = 163/60
In mixed form: 243/60
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/20+20/12 21/20+40/12 21/40+20/12 21/20+20/24 63/20+20/12 21/20+60/12 21/60+20/12 21/20+20/36 21/20+20/60 21/20+20/84