Add 7/20 and 7/42
7/20 + 7/42 is 31/60.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 42 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 20 × 21 = 420,
7/20 = 7 × 21/20 × 21 = 147/420 - Likewise, for the 2nd fraction, since 42 × 10 = 420,
7/42 = 7 × 10/42 × 10 = 70/420 - Add the two like fractions:
147/420 + 70/420 = 147 + 70/420 = 217/420 - 217/420 simplified gives 31/60
- So, 7/20 + 7/42 = 31/60
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/20+7/42 7/20+14/42 7/40+7/42 7/20+7/84 21/20+7/42 7/20+21/42 7/60+7/42 35/20+7/42 7/20+35/42 49/20+7/42 7/20+49/42