Showing posts with label bob. Show all posts
Showing posts with label bob. Show all posts

BOB on Fractions

Wednesday, April 22, 2009
Hi. So. I'm doing this scribe well, post because I'm sure I did pretty BAD on my math test and I want a bonus mark. So here I go.

Adding Fractions
What I understand about it.. I understand that the rule for addition also appiles to subtraction. I also understand how to add fractions. Here, I'll show you :).
2/4+3/8
the first thing you have to do is look for the denominator that both 4 and 8 go into. Oh, make sure it's the smallest common denominator, so that you don't have to simplify it. The LCD is 4.
So,
2/4+3/8 < question
_/4+_/4 < the blank spots are the numbers we need to figure out.
So, you're probably wondering.. "how do we find those numbers?" This is what you do :). You take 4 and divide it by the denominator in the question. So, 4 divided by 4 is 1. You then multiply the answer you got with the numerator from the question. 1x2=2. So your first fraction is 2/4. To get the last fraction, you do the same thing. You take 4 and divide it by 8, which is 4. Then you multiply 4 with the numerator from the question, which is 12. Your second fraction is 12/4.
.. hmm.. so,
2/4+12/4 is your fraction
all you need to do now is add them together!
2+12=14
and the denominator stays the same because it's already.. the same.
14/4. < this is what you call an improper fraction! You need to fix it and make it into a mixed fraction. You have to find out how much times 14 goes into 4. _x4=a number close to 14? 3! 3x4=12. So 14 can only go into 4 1 time, and what do you have left over? 2. So your fraction would look like this..
12/4, BUT YOU STILL NEED TO SIMPLIFY! Reduce 2/4. 1/2.
FINAL ANSWER
11/2

Subtracting Fractions
For subtracting, you basically do the same thing.. but with the final result, you subtract. :) When you can subtract the fraction, you either need to borrow or turn them into improper fractions.

Problems..
My problems with fractions is that I don't really like them. I always have trouble with them! I got use to them this year though, and they were pretty easy and quick to learn. The only problem is I always mess up on my tests.
Subscribe to: Posts (Atom)