Rule 19:
To subtract, the denominators must be equal. You essentially following the same steps as in addition.
Build each fraction so that both denominators are equal.
Combine the numerators according to the operation of subtraction or additions.
The denominators will be the denominator of the built-up fractions.
Reduce the answer.

Problem 1:
Calculate tex2html_wrap_inline34 and reduce your answer.
The answer is tex2html_wrap_inline36 .
The denominators are the same, so you can skip step 1. The denominator of the answer will be 24. Combine the numerators for the numerator in the answer. 13 - 9 = 4.
The answer is tex2html_wrap_inline40 .

Reduce the fraction.
tex2html_wrap_inline42 .

You can check the answer with your calculator. Calculate 13 divided by 24, calculate 9 divided by 24, and subtract the second answer from the first. Now divide 1 by 6. Both answers should be the same. If you are correct, the answers are the same (equivalent) and you have successfully combined two fractions with the operation of subtraction.

[Next Problem] [Menu Back]

S.O.S MATHematics home page

Do you need more help? Please post your question on our S.O.S. Mathematics CyberBoard.

Author:Nancy Marcus

Copyright 1999-2018 MathMedics, LLC. All rights reserved.
Contact us
Math Medics, LLC. - P.O. Box 12395 - El Paso TX 79913 - USA
users online during the last hour