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JSS2: MATHEMATICS - 1ST TERM

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  1. Properties of Whole Numbers I | Week 1
    4 Topics
    |
    1 Quiz
  2. Properties of Whole Numbers II | Week 2
    4 Topics
    |
    1 Quiz
  3. Properties of Whole Numbers III | Week 3
    5 Topics
    |
    1 Quiz
  4. Indices | Week 4
    2 Topics
    |
    1 Quiz
  5. Laws of Indices | Week 5
    5 Topics
    |
    1 Quiz
  6. Whole Numbers & Decimal Numbers | Week 6
    4 Topics
    |
    1 Quiz
  7. Standard Form | Week 7
    3 Topics
    |
    1 Quiz
  8. Significant Figures (S.F) | Week 8
    4 Topics
    |
    1 Quiz
  9. Fractions, Ratios, Proportions & Percentages I | Week 9
    6 Topics
    |
    1 Quiz
  10. Fractions, Ratios, Proportions & Percentages II | Week 10
    4 Topics
    |
    1 Quiz
  11. Fractions, Ratios, Proportions & Percentages III | Week 11
    3 Topics
    |
    1 Quiz
  12. Approximation & Estimation | Week 12
    1 Topic
    |
    1 Quiz



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To convert a percentage to decimal, divide the decimal number by 100.

Example 1

Change the following percentage to decimals.

a. 3.7%

b. \(\scriptsize 25 \frac{1}{2} \%\)

c. 67.8%

Solution

a. 3.7% = \( \frac{3.7}{100}\\ = \scriptsize 0.037 \)

b. \(\scriptsize 25 \frac{1}{2} \%\) = \( \frac{25 \frac{1}{2}}{100} \\ = \large \frac{\frac{51}{2}}{\frac{100}{1}} \\ = \frac{51}{2} \: \times \: \frac{1}{100} \\ = \frac{51}{200} \\= \scriptsize 0.255 \)

Or \(\scriptsize 25 \frac{1}{2} \%\) = \(\frac{25 \frac{1}{2}}{100} \\= \frac{25 .5}{100}\\ = \scriptsize 0.255 \)

c. 67.8% = \( \frac{67.8}{100} \\ = \scriptsize 0.678\)

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