Add 20/21 and 4/63
20/21 + 4/63 is 64/63.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 63 is 63
Next, find the equivalent fraction of both fractional numbers with denominator 63 - For the 1st fraction, since 21 × 3 = 63,
20/21 = 20 × 3/21 × 3 = 60/63 - Likewise, for the 2nd fraction, since 63 × 1 = 63,
4/63 = 4 × 1/63 × 1 = 4/63 - Add the two like fractions:
60/63 + 4/63 = 60 + 4/63 = 64/63 - So, 20/21 + 4/63 = 64/63
In mixed form: 11/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/21+4/63 20/21+8/63 20/42+4/63 60/21+4/63 20/21+12/63 20/63+4/63 20/21+20/63 20/21+28/63