Add 80/42 and 1/35, Solve 1 38/42 + 1/35 as a fraction

Add 80/42 and 1/35

1^st number: 1 38/42, 2^nd number: 1/35

80/42 + 1/35 is 29/15.

Find the least common denominator or LCM of the two denominators:
LCM of 42 and 35 is 210

Next, find the equivalent fraction of both fractional numbers with denominator 210
For the 1st fraction, since 42 × 5 = 210,
80/42 = 80 × 5/42 × 5 = 400/210
Likewise, for the 2nd fraction, since 35 × 6 = 210,
1/35 = 1 × 6/35 × 6 = 6/210
Add the two like fractions:
400/210 + 6/210 = 400 + 6/210 = 406/210
406/210 simplified gives 29/15
So, 80/42 + 1/35 = 29/15
In mixed form: 114/15

MathStep (Works offline)

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