Question

What do i do here to work this out?

Answer 1

In order to combine fractions, they need to have the same denominator.

To figure out what value to make the denominator, find the least common denominator of 4 and 5:

4: 4, 8, 12, 16, 20

5: 5, 10, 15, 20

The LCD is 20, so multiply 4/5 by 4/4 and -1/4 by 5/5 to make the denominator = 20

$(\frac{4}{4} )\frac{4}{5} -(\frac{5}{5} )\frac{1}{4} =$

$\frac{16}{20} -\frac{5}{20} =$    Now combine the fractions

$\frac{16}{20}- \frac{5}{20} =\frac{11}{20}$