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★Data Handling Paper 1
Monday, 4 February 2013 // 0 narnian

 DATA HANDLING

TIPS

  1. A bar graph is a representation of data using either vertical or horizontal bars.
  2. We can recognize the terms such as frequency, mode, range, maximum or minimum value from the bar graph.
    3. Example:

    The bar graph above shows the clothing sizes for a group of pupils.
    (a) How many pupils wear size 8?
    (b) What is the most common size?
    (c) What is the largest size?
    (d) What is the smallest size?
    (e) What is the difference between the largest size and the smallest size?    Answer
    (a) 20 pupils wear size 8.
    (b) The common size is 6.
    (c) The largest size is 12.
    (d) The smallest size is 6.
    (e) The difference between the largest size and the smallest size
    =12 – 6
    =6 

COMMON MISTAKES

Error in interpreting data from pictograph.

Example:


The pictograph shows the number of television produced by a factory in three months. How many televisions were produced in February?
    XNumber of televisions
    produced in February    		= 5 televisions
    √Number of televisions
    produced in February    		= 5 x 5
    = 25 televisions

★Shape And Space Paper 2
// 0 narnian

SHAPE & SPACE (PAPER 2)

TIPS

  1. To calculate the area of a 2-D composite shape of two or more quadrilaterals and triangles, calculate the area of each shape separately. Then, add up all the areas.



COMMON MISTAKES

Error in calculating the perimeter.

Example:
  1. Calculate the perimeter of the whole diagram.



    Incorrect:


    Correct:


★Shape And Space Paper 1
// 0 narnian

SHAPE & SPACE

TIPS

  1. Perimeter of the composite shapes is the total length around the shapes.
  2. We can use measuring tapes, rulers or strings to measure the perimeter of the composite shapes;
  3. The perimeter of the composite shapes can be calculated by adding all the sides of the shapes.
  4. The area of the composite shapes is the amount of surface that it covers.
  5. The area can be measured by counting the number of unit squares that the shape covers on a grid.

COMMON MISTAKES

Error in calculating the area.
Example:
  1. Find the area of the rectangle 6 cm length and 2 cm breadth.
    Incorrect :
    Area= 6 cm + 2 cm + 6 cm + 2 cm
    = 16 cm


    Correct:
    Area= 6 cm x 2 cm
    = 12 cm2