Add 8/90 and 30/21
1st number: 8/90, 2nd number: 1 9/21
8/90 + 30/21 is 478/315.
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,
8/90 = 8 × 7/90 × 7 = 56/630 - Likewise, for the 2nd fraction, since 21 × 30 = 630,
30/21 = 30 × 30/21 × 30 = 900/630 - Add the two like fractions:
56/630 + 900/630 = 56 + 900/630 = 956/630 - 956/630 simplified gives 478/315
- So, 8/90 + 30/21 = 478/315
In mixed form: 1163/315
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/90+30/21 8/90+60/21 8/90+30/42 24/90+30/21 8/90+90/21 8/90+30/63 40/90+30/21 56/90+30/21