Add 63/21 and 42/90
1st number: 3 0/21, 2nd number: 42/90
63/21 + 42/90 is 52/15.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 90 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 21 × 30 = 630,
63/21 = 63 × 30/21 × 30 = 1890/630 - Likewise, for the 2nd fraction, since 90 × 7 = 630,
42/90 = 42 × 7/90 × 7 = 294/630 - Add the two like fractions:
1890/630 + 294/630 = 1890 + 294/630 = 2184/630 - 2184/630 simplified gives 52/15
- So, 63/21 + 42/90 = 52/15
In mixed form: 37/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 63/21+84/90 63/42+42/90