Add 7/70 and 84/72, Solve 7/70 + 1 12/72 as a fraction

Add 7/70 and 84/72

1^st number: 7/70, 2^nd number: 1 12/72

7/70 + 84/72 is 19/15.

Find the least common denominator or LCM of the two denominators:
LCM of 70 and 72 is 2520

Next, find the equivalent fraction of both fractional numbers with denominator 2520
For the 1st fraction, since 70 × 36 = 2520,
7/70 = 7 × 36/70 × 36 = 252/2520
Likewise, for the 2nd fraction, since 72 × 35 = 2520,
84/72 = 84 × 35/72 × 35 = 2940/2520
Add the two like fractions:
252/2520 + 2940/2520 = 252 + 2940/2520 = 3192/2520
3192/2520 simplified gives 19/15
So, 7/70 + 84/72 = 19/15
In mixed form: 14/15

MathStep (Works offline)

Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad