Add 21/18 and 90/80
1st number: 1 3/18, 2nd number: 1 10/80
21/18 + 90/80 is 55/24.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 80 is 720
Next, find the equivalent fraction of both fractional numbers with denominator 720 - For the 1st fraction, since 18 × 40 = 720,
21/18 = 21 × 40/18 × 40 = 840/720 - Likewise, for the 2nd fraction, since 80 × 9 = 720,
90/80 = 90 × 9/80 × 9 = 810/720 - Add the two like fractions:
840/720 + 810/720 = 840 + 810/720 = 1650/720 - 1650/720 simplified gives 55/24
- So, 21/18 + 90/80 = 55/24
In mixed form: 27/24
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/18+90/80 21/36+90/80 63/18+90/80 21/54+90/80 21/90+90/80