Add 21/16 and 25/72, Solve 1 5/16 + 25/72 as a fraction

Add 21/16 and 25/72

1^st number: 1 5/16, 2^nd number: 25/72

21/16 + 25/72 is 239/144.

Find the least common denominator or LCM of the two denominators:
LCM of 16 and 72 is 144

Next, find the equivalent fraction of both fractional numbers with denominator 144
For the 1st fraction, since 16 × 9 = 144,
21/16 = 21 × 9/16 × 9 = 189/144
Likewise, for the 2nd fraction, since 72 × 2 = 144,
25/72 = 25 × 2/72 × 2 = 50/144
Add the two like fractions:
189/144 + 50/144 = 189 + 50/144 = 239/144
So, 21/16 + 25/72 = 239/144
In mixed form: 195/144

MathStep (Works offline)

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