Add 4/90 and 15/21
4/90 + 15/21 is 239/315.
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,
4/90 = 4 × 7/90 × 7 = 28/630 - Likewise, for the 2nd fraction, since 21 × 30 = 630,
15/21 = 15 × 30/21 × 30 = 450/630 - Add the two like fractions:
28/630 + 450/630 = 28 + 450/630 = 478/630 - 478/630 simplified gives 239/315
- So, 4/90 + 15/21 = 239/315
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/90+15/21 4/90+30/21 4/90+15/42 12/90+15/21 4/90+45/21 4/90+15/63 20/90+15/21 4/90+75/21 28/90+15/21