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★Decimals Paper 1
Monday, 4 February 2013 // 0 narnian

DECIMALS (CONVERTING FRACTION TO DECIMALS AND VICE-VERSA, ADDITION & SUBTRACTION)

TIPS

  1. The decimal point separates the whole number part from the fraction part.


  2. Every digit in a decimal has its own place value. The place value of each digit in decimals can be shown using a place value chart.



    The number shown in the place value chart above is read as zero point two six.


COMMON MISTAKES

Error in lining up the decimal points when adding or subtracting.

Example:
  1. 15.28 + 3.6 =

    Incorrect:



    Correct:

DECIMALS (MULTIPLICATION & DIVISION, BODMAS, ROUNDING OFF)

TIPS

  1. To multiply a decimal by 10, 100 or 1 000, move the decimal point 1,2 or 3 places to the right respectively.
    Example:

    6.02 x 10 =


  2. To division a decimal by 10, 100 or 1 000, move the decimal point 1,2 or 3 places to the left respectively.
    Example:

    256.7 /100 =



COMMON MISTAKES

Error in placing the decimal point in the product.

Example:
  1. 3.128 x 12 =

    Incorrect:

    3.128 x 12 = 3.7536



    Correct:

    3.128 x 12 = 37.536