Add 12/20 and 7/42
12/20 + 7/42 is 23/30.
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,
12/20 = 12 × 21/20 × 21 = 252/420 - Likewise, for the 2nd fraction, since 42 × 10 = 420,
7/42 = 7 × 10/42 × 10 = 70/420 - Add the two like fractions:
252/420 + 70/420 = 252 + 70/420 = 322/420 - 322/420 simplified gives 23/30
- So, 12/20 + 7/42 = 23/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/20+7/42 12/20+14/42 12/40+7/42 12/20+7/84 36/20+7/42 12/20+21/42 12/60+7/42 60/20+7/42 12/20+35/42 84/20+7/42 12/20+49/42