Add 15/90 and 5/70
15/90 + 5/70 is 5/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 70 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 90 × 7 = 630,
15/90 = 15 × 7/90 × 7 = 105/630 - Likewise, for the 2nd fraction, since 70 × 9 = 630,
5/70 = 5 × 9/70 × 9 = 45/630 - Add the two like fractions:
105/630 + 45/630 = 105 + 45/630 = 150/630 - 150/630 simplified gives 5/21
- So, 15/90 + 5/70 = 5/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/90+5/70 15/90+10/70 45/90+5/70 15/90+15/70 75/90+5/70 15/90+25/70 15/90+35/70