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Subtract the smaller one from the bigger one, and then put a minus sign before the answer.
You can either convert the decimal to a fraction and then subtract (3/4 - 0.5 = 3/4 - 2/4 = 1/4), OR you can convert the fraction to a decimal and then subtract (3/4 - 0.5 = 0.75 - 0.5 = 0.25).
if they have the same denominator just subtract it . if it doesn't than find the denominator.
Using algebra the number works out as 25