Add 20/45 and 9/20
20/45 + 9/20 is 161/180.
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,
9/20 = 9 × 9/20 × 9 = 81/180 - Add the two like fractions:
80/180 + 81/180 = 80 + 81/180 = 161/180 - So, 20/45 + 9/20 = 161/180
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/45+9/20 20/45+18/20 20/90+9/20 20/45+9/40 60/45+9/20 20/45+27/20 20/45+9/60 20/45+45/20 20/45+63/20