Add 8/21 and 42/63
8/21 + 42/63 is 22/21.
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,
8/21 = 8 × 3/21 × 3 = 24/63 - Likewise, for the 2nd fraction, since 63 × 1 = 63,
42/63 = 42 × 1/63 × 1 = 42/63 - Add the two like fractions:
24/63 + 42/63 = 24 + 42/63 = 66/63 - 66/63 simplified gives 22/21
- So, 8/21 + 42/63 = 22/21
In mixed form: 11/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/21+42/63 8/21+84/63 8/42+42/63 24/21+42/63 8/63+42/63 40/21+42/63 56/21+42/63