Add 70/42 and 4/5, Solve 1 28/42 + 4/5 as a fraction

Add 70/42 and 4/5

1^st number: 1 28/42, 2^nd number: 4/5

70/42 + 4/5 is 37/15.

Find the least common denominator or LCM of the two denominators:
LCM of 42 and 5 is 210

Next, find the equivalent fraction of both fractional numbers with denominator 210
For the 1st fraction, since 42 × 5 = 210,
70/42 = 70 × 5/42 × 5 = 350/210
Likewise, for the 2nd fraction, since 5 × 42 = 210,
4/5 = 4 × 42/5 × 42 = 168/210
Add the two like fractions:
350/210 + 168/210 = 350 + 168/210 = 518/210
518/210 simplified gives 37/15
So, 70/42 + 4/5 = 37/15
In mixed form: 27/15

MathStep (Works offline)

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