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fractions, decimals and percentages


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fractions, decimals and percentages

  1. 1. Percentages? Decimals? Who is afraid of…. Fractions?
  2. 2. fractions percentages decimals Familiarise with the concept of decimals, fractions and percentages
  3. 3. To identify equivalences between fractions, decimals and percent.  To identify the relationship between fractions, decimals and percent  Be able to read, write, order and compare common fractions.
  4. 4. Where we can find Fractions, Percentages in every day life?
  5. 5. There are an estimated 27 million slaves in the world today—more than any other time in history. 218 million children aged 5 - 17 are involved in child labor worldwide. Globally, 1 in 6 children work. Children below the age of 18 years represent between 40 to 50 percent of all forced labor victims. The International Labor Organization (ILO) estimates that more than two thirds of all child labor is in the agricultural sector. Children in rural areas begin agricultural labor as young as 5-7 years old. 126 million children work in hazardous conditions, often enduring beatings, humiliation and sexual violence by their employers. The highest numbers of child laborers are in the Asia/Pacific region, where there are 122 million working children. The highest proportion of child laborers is in Sub Saharan Africa, where 26 percent of children (49 million) are involved in work. Take a look of this article. Notice how fractions and percentages are used to explain and analyse the result of the survey
  6. 6. • Fractions, decimals and percent are different ways of representing an amount. • I.e. We could say 50% of something, or ½ or 0.5. These are all the same quantity. • Fractions are about sharing. You may like to think of them as ‘parts of a whole’. 33% 17% 50%
  7. 7. What are fractions? • A fraction describes part of a whole when the whole is cut into equal parts. • This pizza has been cut into three equal parts. We call these thirds. A third is written as: • Think about two slices. Two slices is two thirds:
  8. 8. 1 3 Tells how many slices you have Tells how many slices the pizza Was cut into
  9. 9. 1 3 Tells how many slices you have Tells how many slices the pizza Was cut into numerator denominator
  10. 10. Writing fractions? • Look at the pictures below. How many parts are these shapes divided into? Represent these shapes as fractions.
  11. 11. Converting between fractions, decimals and %: A same value can be written in different forms. For example: ½ 0.5 50% To convert a fraction into a decimal, divide the top of the fraction by the bottom of the fraction: e.g. ½ = 1÷2 = 0.5 To convert a decimal into a percentage, multiply by 100: e.g. 0.5 x 100 = 50% Is the same as: Is the same as:
  12. 12. Converting between fractions, decimals and %: Place the fraction, decimal and % into the correct blank spaces on the grid. Fraction Decimal % ½ 0.5 ¼ 25% 0.20 1/10 10% 0.75 75% 3/9 100%
  13. 13. Fraction Decimal % ½ 0.5 ¼ 25% 0.20 1/10 10% 0.75 75% 3/9 100%
  14. 14. Helen Holt 14 Sharing Amounts