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JSS1: MATHEMATICS - 1ST TERM

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  1. Whole Numbers I | Week 1
    3Topics
    |
    1 Quiz
  2. Whole Numbers II | Week 2
    1Topic
    |
    1 Quiz
  3. Counting in Base Two | Week 3
    4Topics
    |
    1 Quiz
  4. Arithmetic Operations | Week 4
    3Topics
    |
    1 Quiz
  5. Lowest Common Multiple (LCM) | Week 5
    1Topic
    |
    1 Quiz
  6. Highest Common Factor | Week 6
    1Topic
    |
    1 Quiz
  7. Fraction | Week 7
    7Topics
    |
    1 Quiz
  8. Basic Operations with Fractions I | Week 8
    3Topics
    |
    1 Quiz
  9. Basic Operations with Fractions II | Week 9
    1Topic
    |
    1 Quiz
  10. Directed Numbers | Week 10
    3Topics
    |
    1 Quiz
  11. Estimation and Approximation I | Week 11
    3Topics
    |
    1 Quiz
  12. Estimation and Approximation II | Week 12
    6Topics
    |
    1 Quiz
Lesson 7, Topic 4
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Changing Decimals to Fractions

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Decimal fraction can be expressed as a fraction with a denominator that is a power of ten. 

Example 1

i. Express 0.4 as a fraction

0.4 = \( \frac {4}{10} \)

ii. Express 0.37 as a fraction

0.37 = \( \frac {37}{100} \)

iii. Express 0.419 as a fraction

0.419 = \( \frac {419}{1000} \)

Example 2

Express 0.625 as a fraction in its lowest terms. 

Solution 

0.625 = \( \frac {625}{1000} =\frac {625 \div 25}{1000 \div 25} = \frac {25}{40} \)

This is not its lowest term because we can still divide the numerator and denominator by 5

That is, \(\frac {25 \div 5}{40 \div 5} = \frac {5}{8} \)

Example 3

Express 0.8 as a fraction in its lowest term 

Solution 

0.8 =  \( \frac {8}{10} = \frac {8 \div 2}{10 \div 2} = \frac {4}{5} \)

Hint: The number of decimal places the given decimal number is, determines the power of ten used to divide. 

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