What number should be deducted by the numerator and the denominator of the fraction #7/13# to obtain the fraction #1/3#?
Suppose the value that will be deducted from
Solve the equation
Just to show that you get the same answer if you approach it a very slightly different way
Let the unknown value be represented by
Complying with the wording of the question gives:
But what happens if we change the sign from subtract to add ?
Multiply by 1 and you do not change the value. However, 1 comes in many forms.
Two signs that are not the same give a minus. So
So it works out correctly whichever way you chose as long as you 'fully' follow the rules of mathematics.