Add 42/20 and 15/90
1st number: 2 2/20, 2nd number: 15/90
42/20 + 15/90 is 34/15.
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,
42/20 = 42 × 9/20 × 9 = 378/180 - Likewise, for the 2nd fraction, since 90 × 2 = 180,
15/90 = 15 × 2/90 × 2 = 30/180 - Add the two like fractions:
378/180 + 30/180 = 378 + 30/180 = 408/180 - 408/180 simplified gives 34/15
- So, 42/20 + 15/90 = 34/15
In mixed form: 24/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/20+15/90 42/20+30/90 42/40+15/90 42/20+45/90 42/60+15/90 42/20+75/90