Add 21/18 and 90/10
1st number: 1 3/18, 2nd number: 9 0/10
21/18 + 90/10 is 61/6.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 10 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 18 × 5 = 90,
21/18 = 21 × 5/18 × 5 = 105/90 - Likewise, for the 2nd fraction, since 10 × 9 = 90,
90/10 = 90 × 9/10 × 9 = 810/90 - Add the two like fractions:
105/90 + 810/90 = 105 + 810/90 = 915/90 - 915/90 simplified gives 61/6
- So, 21/18 + 90/10 = 61/6
In mixed form: 101/6
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/18+90/10 21/36+90/10 21/18+90/20 63/18+90/10 21/54+90/10 21/18+90/30 21/90+90/10 21/18+90/50 21/18+90/70