Add 6/21 and 15/45
6/21 + 15/45 is 13/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 45 is 315
Next, find the equivalent fraction of both fractional numbers with denominator 315 - For the 1st fraction, since 21 × 15 = 315,
6/21 = 6 × 15/21 × 15 = 90/315 - Likewise, for the 2nd fraction, since 45 × 7 = 315,
15/45 = 15 × 7/45 × 7 = 105/315 - Add the two like fractions:
90/315 + 105/315 = 90 + 105/315 = 195/315 - 195/315 simplified gives 13/21
- So, 6/21 + 15/45 = 13/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 12/21+15/45 6/21+30/45 6/42+15/45 6/21+15/90 18/21+15/45 6/63+15/45 30/21+15/45 6/21+75/45 42/21+15/45