Add 18/84 and 10/20
18/84 + 10/20 is 5/7.
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,
18/84 = 18 × 5/84 × 5 = 90/420 - Likewise, for the 2nd fraction, since 20 × 21 = 420,
10/20 = 10 × 21/20 × 21 = 210/420 - Add the two like fractions:
90/420 + 210/420 = 90 + 210/420 = 300/420 - 300/420 simplified gives 5/7
- So, 18/84 + 10/20 = 5/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/84+10/20 18/84+10/40 54/84+10/20 18/84+30/20 18/84+10/60 90/84+10/20 18/84+50/20 18/84+70/20