Add 7/42 and 40/20
1st number: 7/42, 2nd number: 2 0/20
7/42 + 40/20 is 13/6.
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,
40/20 = 40 × 21/20 × 21 = 840/420 - Add the two like fractions:
70/420 + 840/420 = 70 + 840/420 = 910/420 - 910/420 simplified gives 13/6
- So, 7/42 + 40/20 = 13/6
In mixed form: 21/6
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/42+40/20 7/42+80/20 7/84+40/20 21/42+40/20 7/42+40/60 35/42+40/20 49/42+40/20