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  • 1. Learning Target:Students will learn how to write fractions and decimals as percents.
  • 2. What is a percent?
  • 3. If a percent is a ratio that compares a number to 100 then how could I use that fact to figure out the percent of a fraction like 17/25?
  • 4. You can write an equivalent ratio to the ratio given with a denominator of 100.17/25 = 68/100 = 68%
  • 5. Write the fraction as a percent.¾7/107/209/50
  • 6. Write the fraction as a percent.¾ = 75/100 = 75%7/10 = 70/100 = 70%7/20 = 35/100 = 35%9/50 = 18/100 = 18%
  • 7. What’s the only problem with finding the percent this way?
  • 8. What’s the only problem with finding the percent this way?A: Not every denominator is going to be a factor of 100 so you there will still be times you will just have to divide the fraction to get a decimal and change it from there.
  • 9. How do you write a decimal as a percent using what we know about how to write a percent as a decimal?
  • 10. To write a percent as a decimal:Divide the value by 100(Move your decimal two places to the left which will make the number smaller.)
  • 11. To write a decimal as a percent:Multiply the value by 100(Move your decimal two places to the right which will make the number bigger.)
  • 12. But we can also write a decimal as a percent by first writing it as a fraction and then using the what we just learned to change the fraction to a percent.
  • 13. Changing a decimal to a percent.0.3 = 3/103/10 = 30/10030/100 = 30%0.105 = 105/1,000105/1,000 = 10.5/10010.5/100 = 10.5%
  • 14. Write the decimal as a percent.0.90.070.041
  • 15. Write the decimal as a percent.0.9 = 9/10 = 90/100 = 90%0.07 = 7/100 = 7%0.041 = 41/1,000 = 4.1/100 = 4.1%
  • 16. Now it is time for us to put all of our ideas together to understand the relationship between a set of numbers.
  • 17. Order the numbers 2/3, 60% and 0.64 from least to greatest.What are the different ways that you could approach this problem?
  • 18. Order the numbers 2/3, 60% and 0.64 from least to greatest.A: 60%, 0.64, 2/3
  • 19. It would be helpful for you to recognize common percents, decimals and fractions such as the ones listed on the top of page 431.
  • 20. You have attended 15 out of 20 computer classes. You must attend 85% of the classes to get a piece of software free. Do you get the software? Explain.
  • 21. You have attended 15 out of 20 computer classes. You must attend 85% of the classes to get a piece of software free. Do you get the software? Explain.A: 15 / 20 = 0.75 = 75%Since 75% < 85% you do not get the software.
  • 22. Can you write fractions and decimals as percents?