Add 21/20 and 60/90
1st number: 1 1/20, 2nd number: 60/90
21/20 + 60/90 is 103/60.
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,
21/20 = 21 × 9/20 × 9 = 189/180 - Likewise, for the 2nd fraction, since 90 × 2 = 180,
60/90 = 60 × 2/90 × 2 = 120/180 - Add the two like fractions:
189/180 + 120/180 = 189 + 120/180 = 309/180 - 309/180 simplified gives 103/60
- So, 21/20 + 60/90 = 103/60
In mixed form: 143/60
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/20+60/90 21/40+60/90 63/20+60/90 21/60+60/90