Add 7/42 and 6/20
7/42 + 6/20 is 7/15.
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,
7/42 = 7 × 10/42 × 10 = 70/420 - Likewise, for the 2nd fraction, since 20 × 21 = 420,
6/20 = 6 × 21/20 × 21 = 126/420 - Add the two like fractions:
70/420 + 126/420 = 70 + 126/420 = 196/420 - 196/420 simplified gives 7/15
- So, 7/42 + 6/20 = 7/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/42+6/20 7/42+12/20 7/84+6/20 7/42+6/40 21/42+6/20 7/42+18/20 7/42+6/60 35/42+6/20 7/42+30/20 49/42+6/20 7/42+42/20