Add 3/84 and 72/90
3/84 + 72/90 is 117/140.
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,
3/84 = 3 × 15/84 × 15 = 45/1260 - Likewise, for the 2nd fraction, since 90 × 14 = 1260,
72/90 = 72 × 14/90 × 14 = 1008/1260 - Add the two like fractions:
45/1260 + 1008/1260 = 45 + 1008/1260 = 1053/1260 - 1053/1260 simplified gives 117/140
- So, 3/84 + 72/90 = 117/140
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/84+72/90 9/84+72/90 15/84+72/90 21/84+72/90