Add 21/6 and 42/40
1st number: 3 3/6, 2nd number: 1 2/40
21/6 + 42/40 is 91/20.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 6 and 40 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 6 × 20 = 120,
21/6 = 21 × 20/6 × 20 = 420/120 - Likewise, for the 2nd fraction, since 40 × 3 = 120,
42/40 = 42 × 3/40 × 3 = 126/120 - Add the two like fractions:
420/120 + 126/120 = 420 + 126/120 = 546/120 - 546/120 simplified gives 91/20
- So, 21/6 + 42/40 = 91/20
In mixed form: 411/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/6+42/40 21/6+84/40 21/12+42/40 21/6+42/80 63/6+42/40 21/18+42/40 21/30+42/40 21/42+42/40