Add 7/4 and 15/30, Solve 1 3/4 + 15/30 as a fraction

Add 7/4 and 15/30

1^st number: 1 3/4, 2^nd number: 15/30

7/4 + 15/30 is 9/4.

Find the least common denominator or LCM of the two denominators:
LCM of 4 and 30 is 60

Next, find the equivalent fraction of both fractional numbers with denominator 60
For the 1st fraction, since 4 × 15 = 60,
7/4 = 7 × 15/4 × 15 = 105/60
Likewise, for the 2nd fraction, since 30 × 2 = 60,
15/30 = 15 × 2/30 × 2 = 30/60
Add the two like fractions:
105/60 + 30/60 = 105 + 30/60 = 135/60
135/60 simplified gives 9/4
So, 7/4 + 15/30 = 9/4
In mixed form: 21/4

MathStep (Works offline)

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