Add 20/21 and 75/18
1st number: 20/21, 2nd number: 4 3/18
20/21 + 75/18 is 215/42.
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,
20/21 = 20 × 6/21 × 6 = 120/126 - Likewise, for the 2nd fraction, since 18 × 7 = 126,
75/18 = 75 × 7/18 × 7 = 525/126 - Add the two like fractions:
120/126 + 525/126 = 120 + 525/126 = 645/126 - 645/126 simplified gives 215/42
- So, 20/21 + 75/18 = 215/42
In mixed form: 55/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/21+75/18 20/42+75/18 20/21+75/36 60/21+75/18 20/63+75/18 20/21+75/54 20/21+75/90