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number : operators(+-/x)
 

 


  • a drop-down menu of resources for 'operators'
    • +   sum(or total) of   addition
    -   difference between   subtraction
    x   product of   multiplication
    /   quotient of   division

    Rules for Multiplication & Division

    multiplication of signs

    a '+' multiplied by a '+' gives a '+'

     

    a '+ ' multiplied by a ' - ' gives a ' - '

     

    a ' - ' multiplied by a '+' also gives a ' - '

     

    a ' - ' multiplied by a ' - ' gives a '+'

    sign division

    a '+' divided by a '+' gives a '+'

     

    a '+ ' divided by a ' - ' gives a ' - '

     

    a ' - 'divided by a '+' also gives a ' - '

     

    a ' - ' divided by a ' - ' gives a '+'

     

     

     

     

     

     

     

     

     

     

     

     

     

     

     

    Why not try out the new GCSE Maths interactive pages?

    Examples

      (+3)(-4)= -12   (-2)/(+9)= -(2/9)  
             
      (-5)(-2)= +10   (+3)/(-5)= -(3/5)  
             
      (+7)(+2)= +14   (+6)/(+7)= +(6/7)  
             
      (-9)(+5)= -45   (-5)/(-2)= +(5/2)  

     

    Operator Precedence ....This is the order in which calculations are performed.

    BIDMAS - brackets, indices, division, multiplication, add, subtract

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    example #1

    4 + 7 x 2 - 3(5 + 9)

    4 + 7 x 2 - 3(14).......work out what is inside the brackets

    4 + 14 - 42...............do the multiplication 7 x 2 and 3 x 14

    18 - 42 ....................add the 4 and 14

    -24 ..........................subtract the 42

    Learn GCSE Maths - use the GCSE Maths Forum to ask questions

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    example #2

    7(12-9 ) x (3+4) - 7 + 8 x 20/5

    7(12-9 ) x (3+4) - 7 + 8 x 20/5.....work out what is inside the brackets

    7(3) x (7) - 7 + 8 x 20/5................division next

    7 x 3 x (7) - 7 + 8 x 4....................multiplication

    21 x 7 - 7 + 32..............................more multiplication

    147 - 7 +32...................................addition

    179 -7...........................................subtraction

    172

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    example #3

    3 + 9(6 - 2) - 12/3 + 4 x 7.....work out what is inside the brackets

    3 + 9(4) - 12/3 + 4 x 7................division next

    3 + 9 x 4 - 4 + 4 x 7...................multiplication

    3 + 36 - 4 + 4 x 7.............................more multiplication

    3 + 36 - 4 + 28 ...................................addition

    67 - 4...........................................subtraction

    63

    GCSE Maths revision from GCSE Maths Tutor

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