Exercise 4 Page 661

To subtract fractions, they need to have the same denominator.

11/35

Practice makes perfect

To subtract fractions, they should have the same denominator. In this exercise, we have two fractions with different denominators. 3/5-2/7In this case, the least common denominator is 35. Let's rewrite our expression so that both fractions have a denominator of 35. To do this, we will multiply the numerator and denominator in the first fraction by 7. After that, we will multiply the numerator and denominator in the second fraction by 5.

3/5-2/7

ExpandFrac

a/b=a * 7/b * 7

3 * 7/5 * 7-2/7

ExpandFrac

a/b=a * 5/b * 5

3 * 7/5 * 7-2 * 5/7 * 5

Multiply

21/35-10/35

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

21/35-10/35

SubFrac