Add 5/21 and 12/30
5/21 + 12/30 is 67/105.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 30 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 21 × 10 = 210,
5/21 = 5 × 10/21 × 10 = 50/210 - Likewise, for the 2nd fraction, since 30 × 7 = 210,
12/30 = 12 × 7/30 × 7 = 84/210 - Add the two like fractions:
50/210 + 84/210 = 50 + 84/210 = 134/210 - 134/210 simplified gives 67/105
- So, 5/21 + 12/30 = 67/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/21+12/30 5/21+24/30 5/42+12/30 5/21+12/60 15/21+12/30 5/21+36/30 5/63+12/30 5/21+12/90 25/21+12/30 5/21+60/30 35/21+12/30 5/21+84/30