Add 15/20 and 18/84
15/20 + 18/84 is 27/28.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 84 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 20 × 21 = 420,
15/20 = 15 × 21/20 × 21 = 315/420 - Likewise, for the 2nd fraction, since 84 × 5 = 420,
18/84 = 18 × 5/84 × 5 = 90/420 - Add the two like fractions:
315/420 + 90/420 = 315 + 90/420 = 405/420 - 405/420 simplified gives 27/28
- So, 15/20 + 18/84 = 27/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/20+18/84 15/20+36/84 15/40+18/84 45/20+18/84 15/20+54/84 15/60+18/84 75/20+18/84 15/20+90/84