Add 15/84 and 72/80
15/84 + 72/80 is 151/140.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 80 is 1680
Next, find the equivalent fraction of both fractional numbers with denominator 1680 - For the 1st fraction, since 84 × 20 = 1680,
15/84 = 15 × 20/84 × 20 = 300/1680 - Likewise, for the 2nd fraction, since 80 × 21 = 1680,
72/80 = 72 × 21/80 × 21 = 1512/1680 - Add the two like fractions:
300/1680 + 1512/1680 = 300 + 1512/1680 = 1812/1680 - 1812/1680 simplified gives 151/140
- So, 15/84 + 72/80 = 151/140
In mixed form: 111/140
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/84+72/80 45/84+72/80 75/84+72/80