Add 72/84 and 84/30
1st number: 72/84, 2nd number: 2 24/30
72/84 + 84/30 is 128/35.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 30 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 84 × 5 = 420,
72/84 = 72 × 5/84 × 5 = 360/420 - Likewise, for the 2nd fraction, since 30 × 14 = 420,
84/30 = 84 × 14/30 × 14 = 1176/420 - Add the two like fractions:
360/420 + 1176/420 = 360 + 1176/420 = 1536/420 - 1536/420 simplified gives 128/35
- So, 72/84 + 84/30 = 128/35
In mixed form: 323/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/84+84/60 72/84+84/90