Add 30/63 and 5/21
30/63 + 5/21 is 5/7.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 63 and 21 is 63
Next, find the equivalent fraction of both fractional numbers with denominator 63 - For the 1st fraction, since 63 × 1 = 63,
30/63 = 30 × 1/63 × 1 = 30/63 - Likewise, for the 2nd fraction, since 21 × 3 = 63,
5/21 = 5 × 3/21 × 3 = 15/63 - Add the two like fractions:
30/63 + 15/63 = 30 + 15/63 = 45/63 - 45/63 simplified gives 5/7
- So, 30/63 + 5/21 = 5/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/63+5/21 30/63+10/21 30/63+5/42 90/63+5/21 30/63+15/21 30/63+5/63 30/63+25/21 30/63+35/21