Maths- Number

All number topics on maths that i need 4 GCSE

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  • Created by: hhh
  • Created on: 01-03-11 20:51


Common Factors and Multiples

KEY Points                                                                                                               

If you can divide 1 number by another the second is a FACTOR of the 1st            


If you multiply 1 number by another the result is a multiple of both the 1st and 2nd numbers

Prime Numbers


Numbers that no factor other than 1 and themselves. These are PRIME NUMBERS For Example- 2, 11 and 29 are prime numbers 



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Powers & Roots



A square root of a number must be squared (multiplyed by itself or raised to the power of 2) to give the number_ ANY positive number has 2 square roots- 1 positive, 1 negative

The cube root of a number has to be cubed (raised to the power of 3) to give the number.


Index Notation useful for showing very large and very small numbers

14 000 000= 1.4 (number between 1 and 10)*10*10*10*10*10*10= 1.4*10_6

 (Underscore on previous line means 10 to the power of 6)



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To change a percentage into a fraction write over 100 and cancel any common factors   EG 20%= 20/100= 1/5

To change a fraction to percentage multiply by 100%  


To find the result of percentage increase or decrease multiply by (1+or-the percentage divided by 100)

42% increased by 23%= 42*1.23=51.66     OR

68 decrease 35%= 68*0.65=44.2

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