Highest Common Factor

Behavioural Objectives: At the end of the lesson, the pupils should be able to:

1. Write out factors of numbers.
2. Identify factors common to numbers.
3. Find out the Highest Common factors of numbers. Highest Common Factors of Numbers
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   Example 1
   Find the H.C.F of 6 & 8.
   Solution
   Factors of 6 are: (1), (2), 3, 6.
   Factors of 8 are: (1), (2), 4, 8.
   Common factor of 6 & 8 are 1 & 2.
   Highest Common factor of 6 & 8 is 2. Example 2. Find the H.C.F of 4, 20 and 60.
   Solution.
   Factors of 4 are: (1), (2), (4).
   Factors of 20 are: (1), (2), (4), 5, 10, 20.
   Factors of 60 are: (1), (2), 3, (4), 5, 6, 10, 12, 15, 20, 30, 60.
   .’.Highest Common Factor are 4, 20, 60, is 4.

Exercises
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Man Primary Mathematics book 4 page 140 exercise C question 2 a-e.

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