JSS2 First Term Mathematics Lesson Note – Fractions

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WEEK 4

FRACTIONS

CONTENT

• Expressing fractions as decimals
• Percentages: Percentages of quantities; expressing one quantity as a percentage of the other; percentage increase and decrease.
• Ratios
• Rates and Proportions
• Word problems

EXPRESSING FRACTIONS AS DECIMALS

There are two methods of doing this conversion. There is the general method which can be used any time and on any type of vulgar fraction. There is also another method where the denominator of the fraction contains power/powers of ten.

In this second case, the given fraction can first be converted to an equivalent fraction.

Examples :

1. Convert the following common fractions to decimal fractions (decimal numbers).  ²/₅; ³/₄; ¹⁴⁴/₂₂₅

Solutions:  

First: we can use the equivalent fractions method, before the general method.

Second: the general method (for all condition) is used when the denominator of the given fraction does not contain power(s) of 10.  This is by dividing the numerator by the denominator mentally or via long-division   previously learnt by students in their Primary School days.

Teacher to demonstrate this approach to students as an alternative.

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