Add 20/45 and 20/90
20/45 + 20/90 is 2/3.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 90 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 45 × 2 = 90,
20/45 = 20 × 2/45 × 2 = 40/90 - Likewise, for the 2nd fraction, since 90 × 1 = 90,
20/90 = 20 × 1/90 × 1 = 20/90 - Add the two like fractions:
40/90 + 20/90 = 40 + 20/90 = 60/90 - 60/90 simplified gives 2/3
- So, 20/45 + 20/90 = 2/3
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/45+20/90 20/45+40/90 20/90+20/90 60/45+20/90 20/45+60/90