Add 45/42 and 15/20
1st number: 1 3/42, 2nd number: 15/20
45/42 + 15/20 is 51/28.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 20 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 42 × 10 = 420,
45/42 = 45 × 10/42 × 10 = 450/420 - Likewise, for the 2nd fraction, since 20 × 21 = 420,
15/20 = 15 × 21/20 × 21 = 315/420 - Add the two like fractions:
450/420 + 315/420 = 450 + 315/420 = 765/420 - 765/420 simplified gives 51/28
- So, 45/42 + 15/20 = 51/28
In mixed form: 123/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/42+15/20 45/42+30/20 45/84+15/20 45/42+15/40 45/42+45/20 45/42+15/60 45/42+75/20