Add 30/15 and 72/84
1st number: 2 0/15, 2nd number: 72/84
30/15 + 72/84 is 20/7.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 84 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 15 × 28 = 420,
30/15 = 30 × 28/15 × 28 = 840/420 - Likewise, for the 2nd fraction, since 84 × 5 = 420,
72/84 = 72 × 5/84 × 5 = 360/420 - Add the two like fractions:
840/420 + 360/420 = 840 + 360/420 = 1200/420 - 1200/420 simplified gives 20/7
- So, 30/15 + 72/84 = 20/7
In mixed form: 26/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/15+72/84 90/15+72/84 30/45+72/84 30/75+72/84