Add 5/21 and 5/45
5/21 + 5/45 is 22/63.
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,
5/21 = 5 × 15/21 × 15 = 75/315 - Likewise, for the 2nd fraction, since 45 × 7 = 315,
5/45 = 5 × 7/45 × 7 = 35/315 - Add the two like fractions:
75/315 + 35/315 = 75 + 35/315 = 110/315 - 110/315 simplified gives 22/63
- So, 5/21 + 5/45 = 22/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/21+5/45 5/21+10/45 5/42+5/45 5/21+5/90 15/21+5/45 5/21+15/45 5/63+5/45 25/21+5/45 5/21+25/45 35/21+5/45 5/21+35/45