Subtract 24/21 from 7/2, Solve 3 1/2

Subtract 24/21 from 7/2

1^st number: 3 1/2, 2^nd number: 1 3/21

7/2 - 24/21 is 33/14.

Find the least common denominator or LCM of the two denominators:
LCM of 2 and 21 is 42

Next, find the equivalent fraction of both fractional numbers with denominator 42
For the 1st fraction, since 2 × 21 = 42,
7/2 = 7 × 21/2 × 21 = 147/42
Likewise, for the 2nd fraction, since 21 × 2 = 42,
24/21 = 24 × 2/21 × 2 = 48/42
Subtract the two like fractions:
147/42 - 48/42 = 147 - 48/42 = 99/42
After reducing the fraction, the answer is 33/14
In mixed form: 25/14

MathStep (Works offline)

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