Add 15/21 and 8/30
15/21 + 8/30 is 103/105.
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,
15/21 = 15 × 10/21 × 10 = 150/210 - Likewise, for the 2nd fraction, since 30 × 7 = 210,
8/30 = 8 × 7/30 × 7 = 56/210 - Add the two like fractions:
150/210 + 56/210 = 150 + 56/210 = 206/210 - 206/210 simplified gives 103/105
- So, 15/21 + 8/30 = 103/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/21+8/30 15/21+16/30 15/42+8/30 15/21+8/60 45/21+8/30 15/21+24/30 15/63+8/30 15/21+8/90 75/21+8/30 15/21+40/30 15/21+56/30