Add 5/20 and 21/45
5/20 + 21/45 is 43/60.
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,
5/20 = 5 × 9/20 × 9 = 45/180 - Likewise, for the 2nd fraction, since 45 × 4 = 180,
21/45 = 21 × 4/45 × 4 = 84/180 - Add the two like fractions:
45/180 + 84/180 = 45 + 84/180 = 129/180 - 129/180 simplified gives 43/60
- So, 5/20 + 21/45 = 43/60
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/20+21/45 5/20+42/45 5/40+21/45 5/20+21/90 15/20+21/45 5/20+63/45 5/60+21/45 25/20+21/45 35/20+21/45