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