Add 28/21 and 42/63
1st number: 1 7/21, 2nd number: 42/63
28/21 + 42/63 is 2/1.
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,
28/21 = 28 × 3/21 × 3 = 84/63 - Likewise, for the 2nd fraction, since 63 × 1 = 63,
42/63 = 42 × 1/63 × 1 = 42/63 - Add the two like fractions:
84/63 + 42/63 = 84 + 42/63 = 126/63 - 126/63 simplified gives 2/1
- So, 28/21 + 42/63 = 2/1
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/21+42/63 28/21+84/63 28/42+42/63 84/21+42/63 28/63+42/63