Add 45/21 and 90/18
1st number: 2 3/21, 2nd number: 5 0/18
45/21 + 90/18 is 50/7.
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,
45/21 = 45 × 6/21 × 6 = 270/126 - Likewise, for the 2nd fraction, since 18 × 7 = 126,
90/18 = 90 × 7/18 × 7 = 630/126 - Add the two like fractions:
270/126 + 630/126 = 270 + 630/126 = 900/126 - 900/126 simplified gives 50/7
- So, 45/21 + 90/18 = 50/7
In mixed form: 71/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/21+90/18 45/42+90/18 45/21+90/36 45/63+90/18 45/21+90/54