Add 20/84 and 8/20
20/84 + 8/20 is 67/105.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 20 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 20 × 21 = 420,
8/20 = 8 × 21/20 × 21 = 168/420 - Add the two like fractions:
100/420 + 168/420 = 100 + 168/420 = 268/420 - 268/420 simplified gives 67/105
- So, 20/84 + 8/20 = 67/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/84+8/20 20/84+16/20 20/84+8/40 60/84+8/20 20/84+24/20 20/84+8/60 20/84+40/20 20/84+56/20