Add 8/21 and 12/63
8/21 + 12/63 is 4/7.
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,
12/63 = 12 × 1/63 × 1 = 12/63 - Add the two like fractions:
24/63 + 12/63 = 24 + 12/63 = 36/63 - 36/63 simplified gives 4/7
- So, 8/21 + 12/63 = 4/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/21+12/63 8/21+24/63 8/42+12/63 24/21+12/63 8/21+36/63 8/63+12/63 40/21+12/63 8/21+60/63 56/21+12/63 8/21+84/63