Add 20/84 and 7/15
20/84 + 7/15 is 74/105.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 15 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 84 × 5 = 420,
20/84 = 20 × 5/84 × 5 = 100/420 - Likewise, for the 2nd fraction, since 15 × 28 = 420,
7/15 = 7 × 28/15 × 28 = 196/420 - Add the two like fractions:
100/420 + 196/420 = 100 + 196/420 = 296/420 - 296/420 simplified gives 74/105
- So, 20/84 + 7/15 = 74/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/84+7/15 20/84+14/15 20/84+7/30 60/84+7/15 20/84+21/15 20/84+7/45 20/84+35/15 20/84+7/75 20/84+49/15