Add 63/90 and 60/21
1st number: 63/90, 2nd number: 2 18/21
63/90 + 60/21 is 249/70.
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,
63/90 = 63 × 7/90 × 7 = 441/630 - Likewise, for the 2nd fraction, since 21 × 30 = 630,
60/21 = 60 × 30/21 × 30 = 1800/630 - Add the two like fractions:
441/630 + 1800/630 = 441 + 1800/630 = 2241/630 - 2241/630 simplified gives 249/70
- So, 63/90 + 60/21 = 249/70
In mixed form: 339/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 63/90+60/42 63/90+60/63