1 / 21

Math 6

Math 6. FINDING PERCENT OF A NUMBER. Objective:. Use a percent to find a part of a whole. A ratio is a comparison of 2 quantities using division. Any number that can be expressed as a ratio is called a rational number. Quick Review…. So what numbers are rational? All fractions

Download Presentation

Math 6

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Math 6 FINDING PERCENT OF A NUMBER

  2. Objective: • Use a percent to find a part of a whole.

  3. A ratio is a comparison of 2 quantities using division. Any number that can be expressed as a ratio is called a rational number. Quick Review…

  4. So what numbers are rational? • All fractions • All whole numbers • All terminating decimals • All repeating decimals

  5. How can a number be expressed as a ratio? • All fractions are ratios.

  6. To write a whole number as a ratio, divide it by 1. • Example:

  7. A terminating decimal can be written as a fraction. • Example: • 0.8362= • A decimal is ‘named’ after the smallest place it occupies.

  8. A repeating decimal is a rational number. • It can be expressed as a ratio. • http://www.youtube.com/watch?v=jVzjopXPMIc

  9. A percent is a ratio of a number to 100. This symbol: % indicates a percent. For example, 40% is the ratio 40 to 100, or .

  10. Write Percents as Fractions Write 35% as a fraction in simplest form. 35% = = Write the percent as a fraction with a denominator of 100. Simplify.

  11. Writing Percents as Decimals Write 43% as a decimal. 43% = = 0.43 Write the percent as a fraction with a denominator of 100. Write the fraction as a decimal.

  12. Writing Percents as Decimals Write 43% as a decimal. 43% = = 0.43 Since 43% means 43/100, divide by 100 to convert to a decimal. (Move the decimal point two places to the left.)

  13. Key Point: In any word problem, when you see the word ‘of’ it generally means you must multiply.

  14. Key Point: To multiply by a percent, first convert it to a decimal then multiply.

  15. To find the percent of a number, convert the percent to a decimal, then multiply the two numbers.

  16. Guided Practice

  17. Guided Practice Find 3% of 12. Find 12.5% of 56. Find 150% of 17.

  18. Guided Practice The regular price of a calculator is $15.40. It is on sale for 30% off the regular price. What is the sale price?

  19. Assignments 1-Finding Percents of a Number (A) 2-M6 HW Percentage Word Problems

  20. When finding percent of a number, simply multiply the decimal equivalent by the number. You may have to complete another step, such as subtraction, to solve a discount price question. In order to be competent in math, you must UNDERSTAND and be able to COMMUNICATE your answer. Conclusion

More Related