Add 21/45 and 6/63
21/45 + 6/63 is 59/105.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 63 is 315
Next, find the equivalent fraction of both fractional numbers with denominator 315 - For the 1st fraction, since 45 × 7 = 315,
21/45 = 21 × 7/45 × 7 = 147/315 - Likewise, for the 2nd fraction, since 63 × 5 = 315,
6/63 = 6 × 5/63 × 5 = 30/315 - Add the two like fractions:
147/315 + 30/315 = 147 + 30/315 = 177/315 - 177/315 simplified gives 59/105
- So, 21/45 + 6/63 = 59/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/45+6/63 21/45+12/63 21/90+6/63 63/45+6/63 21/45+18/63 21/45+30/63 21/45+42/63