Add 1/20 and 21/90
1/20 + 21/90 is 17/60.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 90 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 20 × 9 = 180,
1/20 = 1 × 9/20 × 9 = 9/180 - Likewise, for the 2nd fraction, since 90 × 2 = 180,
21/90 = 21 × 2/90 × 2 = 42/180 - Add the two like fractions:
9/180 + 42/180 = 9 + 42/180 = 51/180 - 51/180 simplified gives 17/60
- So, 1/20 + 21/90 = 17/60
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/20+21/90 1/20+42/90 1/40+21/90 3/20+21/90 1/20+63/90 1/60+21/90 5/20+21/90 7/20+21/90