Add 20/90 and 15/45
20/90 + 15/45 is 5/9.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 45 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 90 × 1 = 90,
20/90 = 20 × 1/90 × 1 = 20/90 - Likewise, for the 2nd fraction, since 45 × 2 = 90,
15/45 = 15 × 2/45 × 2 = 30/90 - Add the two like fractions:
20/90 + 30/90 = 20 + 30/90 = 50/90 - 50/90 simplified gives 5/9
- So, 20/90 + 15/45 = 5/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/90+15/45 20/90+30/45 20/90+15/90 60/90+15/45 20/90+75/45