Add 10/90 and 2/21
10/90 + 2/21 is 13/63.
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,
10/90 = 10 × 7/90 × 7 = 70/630 - Likewise, for the 2nd fraction, since 21 × 30 = 630,
2/21 = 2 × 30/21 × 30 = 60/630 - Add the two like fractions:
70/630 + 60/630 = 70 + 60/630 = 130/630 - 130/630 simplified gives 13/63
- So, 10/90 + 2/21 = 13/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/90+2/21 10/90+4/21 10/90+2/42 30/90+2/21 10/90+6/21 10/90+2/63 50/90+2/21 10/90+10/21 70/90+2/21 10/90+14/21