Add 15/21 and 5/45
15/21 + 5/45 is 52/63.
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,
15/21 = 15 × 15/21 × 15 = 225/315 - Likewise, for the 2nd fraction, since 45 × 7 = 315,
5/45 = 5 × 7/45 × 7 = 35/315 - Add the two like fractions:
225/315 + 35/315 = 225 + 35/315 = 260/315 - 260/315 simplified gives 52/63
- So, 15/21 + 5/45 = 52/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/21+5/45 15/21+10/45 15/42+5/45 15/21+5/90 45/21+5/45 15/21+15/45 15/63+5/45 75/21+5/45 15/21+25/45 15/21+35/45