Posted by CHAYO on Tuesday, June 23, 2009 at 6:03pm.
What models can be used to help explain the concepts of addition and subtraction of rational numbers? What are the benefits to using such a model? What limitations does the model have? Create an addition or subtraction problem and demonstrate how the model might work.

MATH 156  Anonymous, Tuesday, June 23, 2009 at 6:28pm
Cutting a pie into equal slices so you can add or subtract them.
EXAMPLE: 1/4 + 1/2 = 3/4. To get the half slice to equal the size of the quarter slice, you need to cut it in half. Then the half slice becomes two quarter slices. When you add all of the quarter slices together, you have three of them: the original quarter slice, plus two more from cutting the half slice in half to get two more quarter slices that you could add with the original to get a total of 3 quarters, or 3/4. 
MATH 156  Anonymous, Tuesday, June 23, 2009 at 6:31pm
(and for whole numbers, you can think of them as representing entire pies, so when you add or subtract them, no slicing is necessary.)

MATH 156  CHAYO, Tuesday, June 23, 2009 at 7:02pm
CAN YOU PLEASE EXPLAIN EACH QUESTION I'M A LITTLE CONFUSED I'M STUDYING FOR MY MID TERM THAT i'M GOING TO HAVE IN TWO WEEKS. THANKS

MATH 156  bobpursley, Tuesday, June 23, 2009 at 7:43pm
Why don't you explain what you think it means, and let us critique that? We have no idea what you don't understand, the questions to me are straightforward.

MATH 156  CHAYO, Tuesday, June 23, 2009 at 10:28pm
Oh I get it now thanks I was a little confused.

MATH 156  Anonymous, Tuesday, June 30, 2009 at 11:00pm
This is not for a mid term, this is a discussion question for a class, I'm taking it too!

MATH 156  Anonymous, Wednesday, November 18, 2009 at 12:01am
What models can be used to help explain the concepts of addition and subtraction of rational numbers? What are the benefits to using such a model? What limitations does the model have? Create an addition or subtraction problem and demonstrate how the model might work.