Add 21/90 and 8/18
21/90 + 8/18 is 61/90.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 18 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 18 × 5 = 90,
8/18 = 8 × 5/18 × 5 = 40/90 - Add the two like fractions:
21/90 + 40/90 = 21 + 40/90 = 61/90 - So, 21/90 + 8/18 = 61/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/90+8/18 21/90+16/18 21/90+8/36 63/90+8/18 21/90+24/18 21/90+8/54 21/90+40/18 21/90+8/90 21/90+56/18