Add 15/42 and 63/30, Solve 15/42 + 2 3/30 as a fraction

Add 15/42 and 63/30

1^st number: 15/42, 2^nd number: 2 3/30

15/42 + 63/30 is 86/35.

Find the least common denominator or LCM of the two denominators:
LCM of 42 and 30 is 210

Next, find the equivalent fraction of both fractional numbers with denominator 210
For the 1st fraction, since 42 × 5 = 210,
15/42 = 15 × 5/42 × 5 = 75/210
Likewise, for the 2nd fraction, since 30 × 7 = 210,
63/30 = 63 × 7/30 × 7 = 441/210
Add the two like fractions:
75/210 + 441/210 = 75 + 441/210 = 516/210
516/210 simplified gives 86/35
So, 15/42 + 63/30 = 86/35
In mixed form: 216/35

MathStep (Works offline)

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