Thursday, January 20, 2011

Mathematics Definitions by Chinni

4 :Index notation: Index notation is used to repesentent powers, for example
a2 means a × a and here the index is 2
b3 means b × b × b and here the index is 3
c4 means c × c × c × c and here the index is 4
etc.
When there is a number in front of the variable:
4d2 means 4 × d × d.
2e3 means 2 × e × e × e
5: HCF:
Highest Common Factor
The largest common factor of two or more numbers is called the highest common factor (HCF).

Setting out:
Often, we set out the solution as follows:
6: LCM:
Lowest Common Multiple
The smallest common multiple of two or more numbers is called the lowest common multiple (LCM).
E.g. Multiples of 8 are 8, 16, 24, 32, …
Multiples of 3 are 3, 6, 9, 12, 15, 18, 21, 24, …


In general:
To find the lowest common multiple (LCM) of two or more numbers, list the multiples of the larger number and stop when you find a multiple of the other number. This is the LCM.

Example 3
Find the lowest common multiple of 6 and 9.
Solution:
List the multiples of 9 and stop when you find a multiple of 6.
Multiples of 9 are 9, 18, …
Multiples of 6 are 6, 12, 18, …
credits: google.com
http://www.mathsteacher.com.au/year7/ch03_prime/03_lcm/lcm.htm
http://www.bbc.co.uk/schools/gcsebitesize/maths/algebra/indicesrev1.shtml
By: Chinni

No comments:

Post a Comment