Add 25/90 and 63/21
1st number: 25/90, 2nd number: 3 0/21
25/90 + 63/21 is 59/18.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 21 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 90 × 7 = 630,
25/90 = 25 × 7/90 × 7 = 175/630 - Likewise, for the 2nd fraction, since 21 × 30 = 630,
63/21 = 63 × 30/21 × 30 = 1890/630 - Add the two like fractions:
175/630 + 1890/630 = 175 + 1890/630 = 2065/630 - 2065/630 simplified gives 59/18
- So, 25/90 + 63/21 = 59/18
In mixed form: 35/18
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 50/90+63/21 25/90+63/42 75/90+63/21