Add 4/21 and 90/18
1st number: 4/21, 2nd number: 5 0/18
4/21 + 90/18 is 109/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 18 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 21 × 6 = 126,
4/21 = 4 × 6/21 × 6 = 24/126 - Likewise, for the 2nd fraction, since 18 × 7 = 126,
90/18 = 90 × 7/18 × 7 = 630/126 - Add the two like fractions:
24/126 + 630/126 = 24 + 630/126 = 654/126 - 654/126 simplified gives 109/21
- So, 4/21 + 90/18 = 109/21
In mixed form: 54/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/21+90/18 4/42+90/18 4/21+90/36 12/21+90/18 4/63+90/18 4/21+90/54 20/21+90/18 28/21+90/18