Add 42/6 and 21/20
1st number: 7 0/6, 2nd number: 1 1/20
42/6 + 21/20 is 161/20.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 6 and 20 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 6 × 10 = 60,
42/6 = 42 × 10/6 × 10 = 420/60 - Likewise, for the 2nd fraction, since 20 × 3 = 60,
21/20 = 21 × 3/20 × 3 = 63/60 - Add the two like fractions:
420/60 + 63/60 = 420 + 63/60 = 483/60 - 483/60 simplified gives 161/20
- So, 42/6 + 21/20 = 161/20
In mixed form: 81/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/6+21/20 42/6+42/20 42/12+21/20 42/6+21/40 42/6+63/20 42/18+21/20 42/6+21/60 42/30+21/20