# Finding the Percent of a Number (P. 2)

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Curipod generated lesson: "Finding the Percent of a Number". #5-7

## rlopez

Updated 5 months ago

1. Open question
210 seconds
Do you know what the simplest way to find the percent of a number is? Give me your best guess 🤔
2. Slide
60 seconds
"Students will be able to find the percentage of a number." 6.RP.3.c Find a percent of a quantity as a rate per 100, solve problems involving finding the whole, given a part and the percent."
Learning objective:
3. Slide
60 seconds
Percentage: The amount or rate of a number in relationship to 100. For example, 25% is the same as 25 out of 100. Proportion: A comparison between two numbers that are related in some way, usually expressed as a fraction. For example, 4/5 is the same as 4 out of 5. Ratio: A comparison of any two quantities.
Concepts:
4. Slide
60 seconds
Percent means 'out of 100' - it is a way of expressing a number as a fraction of 100. Convert the percentage to a decimal by moving the decimal point two places to the left. For example, to convert 25% to a decimal, you would move the decimal point two places to the left to get 0.25. Multiply the decimal by the whole number. For example, if you want to find 25% of 80, you would multiply 0.25 by 80 to get 20. So, using this method, the calculation for finding 25% of 80 would look like this: Percentage = Percent as Decimal x Whole Number Percentage = 0.25 x 80 Percentage = 20
Finding the Percent of a Number
5. Slide
60 seconds
So, using this method, the calculation for finding 25% of 80 would look like this: Percentage = Percent as Decimal x Whole Number Percentage = 0.25 x 80 Percentage = 20
Finding the Percent of a Number
6. Slide
60 seconds
Let's Give it a try
7. Slide
60 seconds
The symbol '%' is derived from the Latin word 'per centum' meaning 'by the hundred' The percent sign '%' was first used in the 1700s by an astronomer named Pierre Bouguer Percentages are used to compare fractions with different denominators
Did you know?
8. Open question
180 seconds
To find the percentage of a number first you__________ then you___________.
9. Open question
180 seconds
Work together in pairs: What is 25% of 80?
10. Open question
180 seconds
Work together in pairs: Q: What is 25% of 80?
11. Poll
60 seconds
What is 10% of 50?
• 5
• 10
• 50
• 100
12. Poll
60 seconds
What is 20% of 150?
• 30
• 50
• 120
• 200
13. Poll
60 seconds
What is 25% of 400?
• 100
• 200
• 300
• 400
14. Poll
60 seconds
What is 30% of 600?
• 180
• 300
• 450
• 600
15. Poll
60 seconds
What is 15% of 400?
• 60
• 100
• 150
• 400