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Welcome to this IRSC Adult Education Live Virtual Lesson

Welcome to this IRSC Adult Education Live Virtual Lesson. Diana Lenartiene, Ed. S. moderator/instructor. Introducing… your virtual classroom. Respond to poll. Emoticons. Chat. Adjust volume. Percents. Percent of a number Percent formula Percent word problems. What is a percent?.

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Welcome to this IRSC Adult Education Live Virtual Lesson

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  1. Welcome to this IRSC Adult Education Live Virtual Lesson Diana Lenartiene, Ed. S. moderator/instructor

  2. Introducing… your virtual classroom Elluminate Meeting/Classroom

  3. Respond to poll Emoticons Chat Adjust volume

  4. Elluminate Meeting/Classroom

  5. Elluminate Meeting/Classroom

  6. Elluminate Meeting/Classroom

  7. Percents Percent of a number Percent formula Percent word problems

  8. What is a percent? You can recognize a percent by its symbol: % Examples of percent: 50% , 75%, 23%, 100%, 8% …

  9. Percent means per hundred. The 100 represents one whole thing. For example, if there are 23 students in a class, then 23 is 100% of that class. Most of us are familiar with percent as grades, taxes, or interest rates.

  10. We will now watch a video on percents

  11. Fractions, decimals and percents In the following pictures the unit is represented by the entire circle. Notice how the yellow slice can be expressed in three different ways: as a fraction, a percent, or a decimal.  We have a recorded lesson on how to convert them if you need practice.

  12. We are fortunate to have a formula we can use which will help us work with percent. The formula is a proportion. We will learn more about proportion in an upcoming lesson. Is = % Of 100 These words may look confusing right now, but as we move into finding the values, it will all make sense.

  13. We will now watch a video on the proportion formula

  14. Let’s try a problem using the percent formula Problem: 25 is what percent of 60? Use the formula to find out! Is = 25 Percent = ? Of =60 100 (always the same)

  15. Now we cross-multiply. We will name the unknown number X. 25 = X 100 So 25 x 100 = 60 x X Or 2500 = 60X. Then, we divide to find out what X equals 40.16 60 2,500.00 240 100 60 40 36

  16. We now have our answer, 40.16 % The formula will help us find any of the numbers that we need to find. Let’s try another one. Problem: 30 % of 90 is what number? Is = ? 30% Of = 90 100 Go ahead and cross-multiply then divide to see what you get. The answer is on the following slide.

  17. 100X = 2700 100 = 27 So X = 27 27 is 30% of 90!

  18. Percentage Questions Choosing Part and Whole http://www.nwlincs.org/NWLINCSWEB/EITCMath.htm#Percents

  19. Decide what the numbers mean Janet got 34 correct on an exam for a score of 85%. How many were on the exam? Highlight the question. Circle the information. Decide where the numbers belong.

  20. Janet got 34 correct on an exam for a score of 85%. • Fill in the ratio equation. • Solve. • 34 is the part • X is the whole • 85 is the percent

  21. Decide what the numbers mean Randall got 28 out of 30 correct. What was his percentage? Highlight the question. Circle the information. Decide where the numbers belong. Is 28 part of the questions or all the questions? Fill in the ratio diagram.

  22. Randall got 28 out of 30 correct. What was his percentage? • 28 is the part • 30 is the whole • X is the percent

  23. Decide what the numbers mean Walter got a 95% on a quiz with 57 questions. How many did he get correct? Highlight the question. Circle the information. Decide where the numbers belong. Is 57 part of the questions or all the questions? Fill in the ratio diagram.

  24. Walter got a 95% on a quiz with 57 questions. How many did he get correct? • x is the part • 57 is the whole • 95 is the percent

  25. Randall got 28 out of 30 correct. What was his percentage? • 28 is the part • 30 is the whole • X is the percent

  26. Try this one yourself! Georgia will receive a 5% commission for selling an $85,000 home. How much did she earn? Hint! Use the proportion formula!

  27. Set up the proportion and solve: X = 5% $85,000 100% Now cross multiply 100X = 425,000 Then Divide by 100 425,000 ÷ 100 = $4,250. Her commission is $4,250.

  28. We have learned: • That we can use the proportion formula to find a part, the • percent, or the whole thing • That percent means hundredths. • That we can convert between fractions, decimals • and percent (Review from a previous lesson)

  29. Now, you need to make a copy of this screen to send to your teacher for proof of Attendance. This can be done in three easy steps:

  30. If you still have questions, please contact me at: dlenarti@irsc.edu Thank you for viewing this presentation. Diana Lenartiene, IRSC ABE Instructor

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