Add 63/21 and 10/90
1st number: 3 0/21, 2nd number: 10/90
63/21 + 10/90 is 28/9.
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,
10/90 = 10 × 7/90 × 7 = 70/630 - Add the two like fractions:
1890/630 + 70/630 = 1890 + 70/630 = 1960/630 - 1960/630 simplified gives 28/9
- So, 63/21 + 10/90 = 28/9
In mixed form: 31/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 63/21+20/90 63/42+10/90 63/21+30/90 63/21+50/90 63/21+70/90