Add 15/84 and 42/90
15/84 + 42/90 is 271/420.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 90 is 1260
Next, find the equivalent fraction of both fractional numbers with denominator 1260 - For the 1st fraction, since 84 × 15 = 1260,
15/84 = 15 × 15/84 × 15 = 225/1260 - Likewise, for the 2nd fraction, since 90 × 14 = 1260,
42/90 = 42 × 14/90 × 14 = 588/1260 - Add the two like fractions:
225/1260 + 588/1260 = 225 + 588/1260 = 813/1260 - 813/1260 simplified gives 271/420
- So, 15/84 + 42/90 = 271/420
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/84+42/90 15/84+84/90 45/84+42/90 75/84+42/90