Add 21/12 and 8/20
1st number: 1 9/12, 2nd number: 8/20
21/12 + 8/20 is 43/20.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 20 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 12 × 5 = 60,
21/12 = 21 × 5/12 × 5 = 105/60 - Likewise, for the 2nd fraction, since 20 × 3 = 60,
8/20 = 8 × 3/20 × 3 = 24/60 - Add the two like fractions:
105/60 + 24/60 = 105 + 24/60 = 129/60 - 129/60 simplified gives 43/20
- So, 21/12 + 8/20 = 43/20
In mixed form: 23/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/12+8/20 21/12+16/20 21/24+8/20 21/12+8/40 63/12+8/20 21/12+24/20 21/36+8/20 21/12+8/60 21/12+40/20 21/60+8/20 21/12+56/20 21/84+8/20