Add 21/7 and 3/20
1st number: 3 0/7, 2nd number: 3/20
21/7 + 3/20 is 63/20.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 20 is 140
Next, find the equivalent fraction of both fractional numbers with denominator 140 - For the 1st fraction, since 7 × 20 = 140,
21/7 = 21 × 20/7 × 20 = 420/140 - Likewise, for the 2nd fraction, since 20 × 7 = 140,
3/20 = 3 × 7/20 × 7 = 21/140 - Add the two like fractions:
420/140 + 21/140 = 420 + 21/140 = 441/140 - 441/140 simplified gives 63/20
- So, 21/7 + 3/20 = 63/20
In mixed form: 33/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/7+3/20 21/7+6/20 21/14+3/20 21/7+3/40 63/7+3/20 21/7+9/20 21/7+3/60 21/7+15/20 21/35+3/20 21/7+21/20 21/49+3/20