Add 54/90 and 20/80
54/90 + 20/80 is 17/20.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 80 is 720
Next, find the equivalent fraction of both fractional numbers with denominator 720 - For the 1st fraction, since 90 × 8 = 720,
54/90 = 54 × 8/90 × 8 = 432/720 - Likewise, for the 2nd fraction, since 80 × 9 = 720,
20/80 = 20 × 9/80 × 9 = 180/720 - Add the two like fractions:
432/720 + 180/720 = 432 + 180/720 = 612/720 - 612/720 simplified gives 17/20
- So, 54/90 + 20/80 = 17/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/90+40/80 54/90+60/80