Add 90/18 and 8/21
1st number: 5 0/18, 2nd number: 8/21
90/18 + 8/21 is 113/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 21 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 18 × 7 = 126,
90/18 = 90 × 7/18 × 7 = 630/126 - Likewise, for the 2nd fraction, since 21 × 6 = 126,
8/21 = 8 × 6/21 × 6 = 48/126 - Add the two like fractions:
630/126 + 48/126 = 630 + 48/126 = 678/126 - 678/126 simplified gives 113/21
- So, 90/18 + 8/21 = 113/21
In mixed form: 58/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/18+16/21 90/36+8/21 90/18+8/42 90/18+24/21 90/54+8/21 90/18+8/63 90/18+40/21 90/18+56/21