Add 21/63 and 10/45
21/63 + 10/45 is 5/9.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 63 and 45 is 315
Next, find the equivalent fraction of both fractional numbers with denominator 315 - For the 1st fraction, since 63 × 5 = 315,
21/63 = 21 × 5/63 × 5 = 105/315 - Likewise, for the 2nd fraction, since 45 × 7 = 315,
10/45 = 10 × 7/45 × 7 = 70/315 - Add the two like fractions:
105/315 + 70/315 = 105 + 70/315 = 175/315 - 175/315 simplified gives 5/9
- So, 21/63 + 10/45 = 5/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/63+10/45 21/63+20/45 21/63+10/90 21/63+30/45 21/63+50/45 21/63+70/45