Add 80/45 and 90/20
1st number: 1 35/45, 2nd number: 4 10/20
80/45 + 90/20 is 113/18.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 20 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 45 × 4 = 180,
80/45 = 80 × 4/45 × 4 = 320/180 - Likewise, for the 2nd fraction, since 20 × 9 = 180,
90/20 = 90 × 9/20 × 9 = 810/180 - Add the two like fractions:
320/180 + 810/180 = 320 + 810/180 = 1130/180 - 1130/180 simplified gives 113/18
- So, 80/45 + 90/20 = 113/18
In mixed form: 65/18
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/90+90/20 80/45+90/40 80/45+90/60