Add 40/42 and 7/20
40/42 + 7/20 is 547/420.
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,
40/42 = 40 × 10/42 × 10 = 400/420 - Likewise, for the 2nd fraction, since 20 × 21 = 420,
7/20 = 7 × 21/20 × 21 = 147/420 - Add the two like fractions:
400/420 + 147/420 = 400 + 147/420 = 547/420 - So, 40/42 + 7/20 = 547/420
In mixed form: 1127/420
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/42+7/20 40/42+14/20 40/84+7/20 40/42+7/40 40/42+21/20 40/42+7/60 40/42+35/20 40/42+49/20