Add 3/80 and 84/70, Solve 3/80 + 1 14/70 as a fraction

Add 3/80 and 84/70

1^st number: 3/80, 2^nd number: 1 14/70

3/80 + 84/70 is 99/80.

Find the least common denominator or LCM of the two denominators:
LCM of 80 and 70 is 560

Next, find the equivalent fraction of both fractional numbers with denominator 560
For the 1st fraction, since 80 × 7 = 560,
3/80 = 3 × 7/80 × 7 = 21/560
Likewise, for the 2nd fraction, since 70 × 8 = 560,
84/70 = 84 × 8/70 × 8 = 672/560
Add the two like fractions:
21/560 + 672/560 = 21 + 672/560 = 693/560
693/560 simplified gives 99/80
So, 3/80 + 84/70 = 99/80
In mixed form: 119/80

MathStep (Works offline)

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