Add 20/45 and 25/20
1st number: 20/45, 2nd number: 1 5/20
20/45 + 25/20 is 61/36.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 20 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 45 × 4 = 180,
20/45 = 20 × 4/45 × 4 = 80/180 - Likewise, for the 2nd fraction, since 20 × 9 = 180,
25/20 = 25 × 9/20 × 9 = 225/180 - Add the two like fractions:
80/180 + 225/180 = 80 + 225/180 = 305/180 - 305/180 simplified gives 61/36
- So, 20/45 + 25/20 = 61/36
In mixed form: 125/36
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/45+25/20 20/45+50/20 20/90+25/20 20/45+25/40 60/45+25/20 20/45+75/20 20/45+25/60