Add 1/90 and 15/21
1/90 + 15/21 is 457/630.
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,
1/90 = 1 × 7/90 × 7 = 7/630 - Likewise, for the 2nd fraction, since 21 × 30 = 630,
15/21 = 15 × 30/21 × 30 = 450/630 - Add the two like fractions:
7/630 + 450/630 = 7 + 450/630 = 457/630 - So, 1/90 + 15/21 = 457/630
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/90+15/21 1/90+30/21 1/90+15/42 3/90+15/21 1/90+45/21 1/90+15/63 5/90+15/21 1/90+75/21 7/90+15/21