Add 15/42 and 1/20
15/42 + 1/20 is 57/140.
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,
15/42 = 15 × 10/42 × 10 = 150/420 - Likewise, for the 2nd fraction, since 20 × 21 = 420,
1/20 = 1 × 21/20 × 21 = 21/420 - Add the two like fractions:
150/420 + 21/420 = 150 + 21/420 = 171/420 - 171/420 simplified gives 57/140
- So, 15/42 + 1/20 = 57/140
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/42+1/20 15/42+2/20 15/84+1/20 15/42+1/40 45/42+1/20 15/42+3/20 15/42+1/60 75/42+1/20 15/42+5/20 15/42+7/20