Exercise 66 Page 533

When adding or subtracting fractions, they should have the same denominator. In this exercise, we have two fractions with different denominators. 7/24 - 5/36Since 36 is not an integer multiple of 24, we need to find the least common multiple of the denominators. In our case, it is 72. Let's now multiply both denominators by, respectively, 3 and 2 to obtain a common denominator.

7/24-5/36

ExpandFrac

a/b=a * 3/b * 3

7*3/24*3-5/36

ExpandFrac

a/b=a * 2/b * 2

7*3/24*3-5*2/36*2

Multiply

Multiply

21/72-10/72

Now that we have a common denominator, we can proceed to simplifying the expression.

21/72-10/72

SubFrac

Subtract fractions

21-10/72

SubTerm

Subtract term

11/72