Add 9/20 and 15/45
9/20 + 15/45 is 47/60.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 45 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 20 × 9 = 180,
9/20 = 9 × 9/20 × 9 = 81/180 - Likewise, for the 2nd fraction, since 45 × 4 = 180,
15/45 = 15 × 4/45 × 4 = 60/180 - Add the two like fractions:
81/180 + 60/180 = 81 + 60/180 = 141/180 - 141/180 simplified gives 47/60
- So, 9/20 + 15/45 = 47/60
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/20+15/45 9/20+30/45 9/40+15/45 9/20+15/90 27/20+15/45 9/60+15/45 45/20+15/45 9/20+75/45 63/20+15/45