Add 21/90 and 2/10
21/90 + 2/10 is 13/30.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 10 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 90 × 1 = 90,
21/90 = 21 × 1/90 × 1 = 21/90 - Likewise, for the 2nd fraction, since 10 × 9 = 90,
2/10 = 2 × 9/10 × 9 = 18/90 - Add the two like fractions:
21/90 + 18/90 = 21 + 18/90 = 39/90 - 39/90 simplified gives 13/30
- So, 21/90 + 2/10 = 13/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/90+2/10 21/90+4/10 21/90+2/20 63/90+2/10 21/90+6/10 21/90+2/30 21/90+2/50 21/90+14/10 21/90+2/70