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Maths help greatly needed please :)

Ok, I have a maths exam this Tuesday and Im really stuck with one part of my revision.
Prime factorisations.
I just can’t understand it! Ive searched the web for over an hour trying to look for what it is!
Ive been on every revision website I know and I still can’t find anything!
Its really beginning to frustrate me because I more or less know that one of the first questions on the paper will be on this. The beginning of the paper is where you pick up grades and if I get them wrong Im more or less doomed to failure.
I may be overreacting a little at the moment but I just needed to know.
What are Prime Factorisations?
How do I work them out?

This open post was written 12 months ago | V/U/S: 261, 6, 3 | Edit Post | Leave a reply | Report Post


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grey . offline Verified User (1 year) Long Term User Shouts: 7 #
An Unknown Location | 12 months ago (4 minutes after post)

hey can you post a question……
i am indian and v have factorisations but i want to know exactly what type of help you need….. just post one of questions from ur book…….

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Creal Default offline Verified User (2 years, 12 months) Long Term User Shouts: 2 #
Houston, TX, US | 12 months ago (13 minutes after post)

Prime factorizations is taking one number and continuously dividing it by prime numbers until the last quotient is a prime. All of the divisible numbers are part of the prime factorization.

An example is 84
84 / 2 = 42
42 / 2 = 21
21 / 3 = 7

Since 7 is prime, the factorization stops there. The prime factorization should then be: 2 * 2 * 3 * 7

You can play around at this site if you need more help:
http://www.freeonlinecalculator.net/c…

Here are the prime numbers for 1 - 100:
2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,61,67,71,73,79,83,89,97

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Anonymous #
12 months ago (15 minutes after post)

Creal Default wrote:
Prime factorizations is taking one number and continuously dividing it by prime numbers until the last quotient is a prime. All of the divisible numbers are part of the prime factorization.An example is 8484 / 2 = 4242 / 2 = 2121 / 3 = 7Since 7 is prime, the factorization stops there. The prime factorization should then be: 2 * 2 * 3 * 7You can play around at this site if you need more help:http://www.freeonlinecalculator.net/calculators/math/prime-factors.phpH ere are the prime numbers for 1 - 100:2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,61,67,71,73,79,83,89,97

Oh yeah I understand now!
Thank you so much!
x

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Smarty offline Verified User (2 years, 3 months) Long Term User Shouts: 5 #
An Undisclosed Location | 12 months ago (2 hours, 36 minutes after post)

Oh I remember Prime factorisations…. when maths was fun hehe, if you can call it fun :P

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Help me with: Just a rant… Ignore :) Spelling and grammar etc is going out the window for this one…..
closed offline Verified User (1 year, 2 months) Long Term User Shouts: 53 #
An Undisclosed Location | 12 months ago (4 hours, 24 minutes after post)

The BBC have revision websites. Have a look:
http://www.bbc.co.uk/schools/gcsebite…

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joecanada offline Verified User (5 months, 2 weeks) Long Term User Shouts: 0 #
An Unknown Location | 5 months, 2 weeks ago (6 months, 2 weeks after post)

tools you need. 1. calculator ( or brain) 2. list of primes ( 2,3,5,7,11,13,17,etc.) try writing them down at least once 3. pencil 4.paper.

put # into calculator and see if 2 divides it evenly. yes! record the 2 in your answer. if no try next prime. if it divides record 3 etc. after a few times stepping through with the calculator you will see the pattern but likely by then the class will be at binomial factoring or trinomial factoring. try paying attention in class. most teachers give you time to practice new material in class. or trying making notes instead of texting all class. good luck

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