Addition and subtraction of like fractions (yes you still do this in grade 8)

The difference between adding these fractions in elementary school and doing so in grade 8 is that you will have to use your integer rules to know how to add them. remember that when adding integers if the signs are the same add the numbers and keep the sign. If they are different, subtract the numbers and keep the sign.

You can change any subtraction problem to addition using keep change change.

Homework tonight : read pg. 108-109 do numbers 11-28,44,45


Test corrections due wednesday.



Web assignment due friday : Go to study island and do the assignment ocalled "Operations on rational numbers".


The following video explains how to do the homework for tonight.

How do you divide rational numbers that are in fraction form?

To divide rational numbers that are in fraction form you just need to change the problem to multiplication using the multiplicative inverse. You should do KEEP CHANGE FLIP. Keep the first fraction the same, then change the operation to multiplication and flip the second fraction.

More on operations on rational numbers- multiplying fractions

To multiply fractions remember that like signs have a positive answer when multiplying, and unlike signs have a negative answer. Also to get the product you must multiply the numerators then multiply the denominators, and simplify as necessary.

The homework tonight is to read pg. 102 - 104 and do numbers 13-36,47,48

Also define : multiplicative inverse and reciprocal.

Identifying words or ideas that indicate addition, subtraction, or multiplication

The key to knowing what operation to do in a word problem is to understand what information is actually being given (what ideas or processes is the question indicating). Along with that you should know what operation certain key words indicate.


No Homework tonight.

Operations on rational numbers

The assignment today was to complete all problems for section 2-2 in the glencoe study guide and intervention book.

Also students were to complete the first four problems on page 13 of the glencoemastering the TAKS book.


Tonight's homework is to read pg. 96-98 and do numbers 12-29,55,56

If you do not remember how to access the textbook online click here.


Since we will soon discuss operations on rational numbers you should review how to perform operations on integers. Also, start to think about when a word problem requires addition, subtraction, multiplication, or division.

Questions about wednesday night's homework

The following video explains some of the questions that students had trouble with on the homework that was given on Wednesday 9/2/09

About the test

Unfortunately I was unable to upload a practice test and answers.
The answers to Friday's test are below if you would like to print a copy go to the sidebar and click inside of the box titled "box.net"

Open publication - Free publishing - More rational

The following video explains how the test questions should have been worked out and explains some of the errors in the above document. Unfortunately, there are also a few typing errors "fraction decimal" should just be "decimal."



If you would like to learn more about rational numbers click here or here. This link contains examples of how this question may be tested on the TAKS test.