Add 15/84 and 72/90
15/84 + 72/90 is 137/140.
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,
72/90 = 72 × 14/90 × 14 = 1008/1260 - Add the two like fractions:
225/1260 + 1008/1260 = 225 + 1008/1260 = 1233/1260 - 1233/1260 simplified gives 137/140
- So, 15/84 + 72/90 = 137/140
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/84+72/90 45/84+72/90 75/84+72/90