Add 80/28 and 70/42, Solve 2 24/28 + 1 28/42 as a fraction

Add 80/28 and 70/42

1^st number: 2 24/28, 2^nd number: 1 28/42

80/28 + 70/42 is 95/21.

Find the least common denominator or LCM of the two denominators:
LCM of 28 and 42 is 84

Next, find the equivalent fraction of both fractional numbers with denominator 84
For the 1st fraction, since 28 × 3 = 84,
80/28 = 80 × 3/28 × 3 = 240/84
Likewise, for the 2nd fraction, since 42 × 2 = 84,
70/42 = 70 × 2/42 × 2 = 140/84
Add the two like fractions:
240/84 + 140/84 = 240 + 140/84 = 380/84
380/84 simplified gives 95/21
So, 80/28 + 70/42 = 95/21
In mixed form: 411/21

MathStep (Works offline)

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