Add 21/7 and 6/20
1st number: 3 0/7, 2nd number: 6/20
21/7 + 6/20 is 33/10.
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,
6/20 = 6 × 7/20 × 7 = 42/140 - Add the two like fractions:
420/140 + 42/140 = 420 + 42/140 = 462/140 - 462/140 simplified gives 33/10
- So, 21/7 + 6/20 = 33/10
In mixed form: 33/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/7+6/20 21/7+12/20 21/14+6/20 21/7+6/40 63/7+6/20 21/7+18/20 21/7+6/60 21/7+30/20 21/35+6/20 21/7+42/20 21/49+6/20