Add 72/84 and 12/70
72/84 + 12/70 is 36/35.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 70 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 70 × 6 = 420,
12/70 = 12 × 6/70 × 6 = 72/420 - Add the two like fractions:
360/420 + 72/420 = 360 + 72/420 = 432/420 - 432/420 simplified gives 36/35
- So, 72/84 + 12/70 = 36/35
In mixed form: 11/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/84+24/70 72/84+36/70 72/84+60/70 72/84+84/70