Add 21/63 and 35/90
21/63 + 35/90 is 13/18.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 63 and 90 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 63 × 10 = 630,
21/63 = 21 × 10/63 × 10 = 210/630 - Likewise, for the 2nd fraction, since 90 × 7 = 630,
35/90 = 35 × 7/90 × 7 = 245/630 - Add the two like fractions:
210/630 + 245/630 = 210 + 245/630 = 455/630 - 455/630 simplified gives 13/18
- So, 21/63 + 35/90 = 13/18
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/63+35/90 21/63+70/90