Objective
By the end of this lesson, you will be able to demonstrate knowledge of decimals and percentages in everyday contexts.
Materials and Prep
- Pencil and paper
No prior knowledge is required for this lesson.
Activities
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Activity 1: Shopping Challenge
Imagine you have a budget of $50. Browse through online stores and find three items you would like to buy. Write down the price of each item as a decimal. Calculate the total cost of the items and then convert it into a percentage of your budget. How much of your budget would be spent on these items?
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Activity 2: Percentage of a Whole
Think of a scenario where you have a total of 100 objects. For example, you can imagine having 100 candies. Now, calculate the following:
- What percentage of the candies would you have if you ate 25 of them?
- What percentage would you have if you gave away 50 of them?
- What percentage would you have if you shared 20 of them equally with your friends?
Talking Points
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Decimals are a way to represent numbers that are less than one. They are written with a decimal point, such as 0.5 or 0.75.
For example, if you have $5.50, the decimal part represents 50 cents.
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Percentages are a way to represent parts of a whole out of 100. They are written with the percent symbol (%).
For example, if you score 80% on a test, it means you got 80 out of 100 questions correct.
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When calculating the percentage of a whole, you can use the formula:
Percentage = (Part / Whole) * 100
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Decimals and percentages are used in everyday life. For example, when shopping, discounts are often given as a percentage off the original price.
Understanding decimals and percentages can help you make informed decisions about spending and saving money.