How do you do a subtraction fraction

divide top from bottom

3/4-2/5=7/20

Solution with Steps

3/4-2/5=?

The fractions have unlike denominators. First, find the Least Common Denominator and rewrite the fractions with the common denominator.

LCD (3/4, 2/5) = 20

Multiply both the numerator and denominator of each fraction by the number that makes its denominator equal the LCD. This is basically multiplying each fraction by 1.

(3/4*5/5) - (2/5*4/4) = ?

Complete the multiplication and the equation becomes

15/20-8/20=?

The two fractions now have like denominators so you can subtract the numerators.

Then:

15-8/20=7/20

This fraction cannot be reduced.

Therefore:

3/4-2/5=7/20

Solution by Formulas

Apply the fractions formula for subtraction, to

3/4-2/5

and solve

(3*5) - (2*4) / 4*5

=15-8/20

=7/20

Therefore:

3/4-2/5=7/20