Add 10/20 and 7/42
10/20 + 7/42 is 2/3.
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,
10/20 = 10 × 21/20 × 21 = 210/420 - Likewise, for the 2nd fraction, since 42 × 10 = 420,
7/42 = 7 × 10/42 × 10 = 70/420 - Add the two like fractions:
210/420 + 70/420 = 210 + 70/420 = 280/420 - 280/420 simplified gives 2/3
- So, 10/20 + 7/42 = 2/3
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/20+14/42 10/40+7/42 10/20+7/84 30/20+7/42 10/20+21/42 10/60+7/42 50/20+7/42 10/20+35/42 70/20+7/42 10/20+49/42