Add 45/80 and 18/90
45/80 + 18/90 is 61/80.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 90 is 720
Next, find the equivalent fraction of both fractional numbers with denominator 720 - For the 1st fraction, since 80 × 9 = 720,
45/80 = 45 × 9/80 × 9 = 405/720 - Likewise, for the 2nd fraction, since 90 × 8 = 720,
18/90 = 18 × 8/90 × 8 = 144/720 - Add the two like fractions:
405/720 + 144/720 = 405 + 144/720 = 549/720 - 549/720 simplified gives 61/80
- So, 45/80 + 18/90 = 61/80
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/80+18/90 45/80+36/90 45/80+54/90