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★Whole Numbers Paper 2
Monday, 4 February 2013 // 0 narnian

WHOLE NUMBERS (PAPER 2 -MULTIPLICATION & DIVISION)

TIPS

  1. 692 x 100 =
    Answer:
    692 x 100 = 69 200 
  2. 727 x 1 000 =
    Answer:
    727 x 1 000 = 727 000 
  3. 729 200 / 100 =
    Answer:
    729 200 / 100 = 7 292 
  4. 726 000 / 1 000 =
    Answer:
    726 000 / 1 000 = 726 


COMMON MISTAKES

Error in order of operations.
Example:
  1. 60 000 / 3 x 4 =

    Incorrect:
    60 000 / 3 x 4
    = 60 000 / 12
    = 5 000

    Correct:
    60 000 / 3 x 4
    = 20 000 x 4
    = 80 000

WHOLE NUMBERS (PAPER 2 - MIX OPERATION & BODMAS)

TIPS

  1. Arrange the numbers according to their place values before adding from right to left.
  2. In mixed operations involving multiplication and addition, do the multiplication first.
  3. In mixed operation involving brackets, do the operations in the brackets first.
For example,
(33 + 24) x (120 – 85) =
(33 + 24) x (120 – 85) = 1 995



COMMON MISTAKES

Error in calculations involving mixed operations.
Example:
  1. 2 450 + 1 360 x 24 =

    Incorrect:
    2 450 + 1 360 x 24
    = 3 810 x 24
    = 91 440

    Correct:
    2 450 + 1 360 x 24
    = 2 450 + 32 640
    = 35 090