4 :Index notation: Index notation is used to repesentent powers, for example

a

^{2}means a × a and here the index is 2b

^{3}means b × b × b and here the index is 3c

^{4}means c × c × c × c and here the index is 4etc.

When there is a number in front of the variable:

4d

^{2}means 4 × d × d.2e

^{3}means 2 × e × e × e5: 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, … |

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

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