Add 21/63 and 42/20
1st number: 21/63, 2nd number: 2 2/20
21/63 + 42/20 is 73/30.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 63 and 20 is 1260
Next, find the equivalent fraction of both fractional numbers with denominator 1260 - For the 1st fraction, since 63 × 20 = 1260,
21/63 = 21 × 20/63 × 20 = 420/1260 - Likewise, for the 2nd fraction, since 20 × 63 = 1260,
42/20 = 42 × 63/20 × 63 = 2646/1260 - Add the two like fractions:
420/1260 + 2646/1260 = 420 + 2646/1260 = 3066/1260 - 3066/1260 simplified gives 73/30
- So, 21/63 + 42/20 = 73/30
In mixed form: 213/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/63+42/20 21/63+84/20 21/63+42/40 21/63+42/60