Add 21/7 and 27/20
1st number: 3 0/7, 2nd number: 1 7/20
21/7 + 27/20 is 87/20.
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,
27/20 = 27 × 7/20 × 7 = 189/140 - Add the two like fractions:
420/140 + 189/140 = 420 + 189/140 = 609/140 - 609/140 simplified gives 87/20
- So, 21/7 + 27/20 = 87/20
In mixed form: 47/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/7+27/20 21/7+54/20 21/14+27/20 21/7+27/40 63/7+27/20 21/7+81/20 21/7+27/60 21/35+27/20 21/49+27/20