Exercise 69 Page 683

When adding or subtracting fractions, they should have the same denominator. In this exercise, we have two fractions with different denominators. 1/4 - 1/3Notice that 4 and 3 do not have a common factor greater than 1. Let's multiply the numerator and denominator of the first fraction by 3 and the numerator and denominator of the second fraction by 4 to create a common denominator.

1/4-1/3

ExpandFrac

a/b=a * 3/b * 3

1 * 3/4 * 3 - 1/3

ExpandFrac

a/b=a * 4/b * 4

1 * 3/4 * 3 - 1 * 4/3 * 4

Multiply

Multiply

3/12 - 4/12

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

3/12 - 4/12

SubFrac

Subtract fractions

3 - 4/12

SubTerm

Subtract term

- 1/12

MoveNegNumToFrac

Put minus sign in front of fraction

- 1/12