Add 90/20 and 45/90
1st number: 4 10/20, 2nd number: 45/90
90/20 + 45/90 is 5/1.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 90 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 20 × 9 = 180,
90/20 = 90 × 9/20 × 9 = 810/180 - Likewise, for the 2nd fraction, since 90 × 2 = 180,
45/90 = 45 × 2/90 × 2 = 90/180 - Add the two like fractions:
810/180 + 90/180 = 810 + 90/180 = 900/180 - 900/180 simplified gives 5/1
- So, 90/20 + 45/90 = 5/1
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/40+45/90 90/60+45/90