Exercise 28 Page 334

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

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Practice makes perfect

When adding or subtracting fractions, they should have the same denominator. In this exercise, we have two fractions with different denominators. 11/15 - 3/20Now, notice that 15 * 4 = 60 and 20 * 3 = 60. We can multiply both the numerator and denominator of 11 15 by 4 and multiply the numerator and denominator of 3 20 by 3 to create a common denominator of 60. Let's do it!

11/15 - 3/20

ExpandFrac

a/b=a * 4/b * 4

11 * 4/15 * 4 - 3/20

ExpandFrac

a/b=a * 3/b * 3

11 * 4/15 * 4 - 3 * 3/20 * 3

Multiply

44/60 - 9/60

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

44/60 - 9/60

SubFrac