Exact Value or It’s About …

Which to Use?

Middle School Mathematics

6.4, 7.1, 8.1b, and 8.1c

Designed bySheeran Flournoy

INTRODUCTION

Sometimes you need to know an easier number to use when you’re figuring out the solution to a problem. For example, which is easier to use: . or ? 793.865 or 794? Sometimes an exact number is needed, but sometimes an estimated number is better. When you’re asking your parents for money to go to the movies, you can give an estimated number. However, when you’re paying for several items at the mall, you need to know the exact cost.

THE TASK

You’re going to go to several web sites and investigate how to change numbers from one form to another. You will need to complete a log of your journey by recording your visits to the various sites. At the end of your trip, you will return home and take an on-line quiz.

THE PROCESS

Start your journey by clicking on one of the web sites listed in the Resources section of this Web Quest. Continue your journey with visits to the other sites listed and follow the special directions for each link.

RESOURCES

Estimating and Rounding Decimals

·  Visit all 4 steps and complete the workout.

Rounding Number - Lesson 9

·  You can skip the intro, and then click on the Lessons button. Click on Lesson 9 – Rounding

Percents

·  Visit all 4 steps and complete the workout.

Percent Estimation - Pie Chart

·  Do at least 10 estimations.

Order Decimal Game

·  Click and read the Key ideas. On the left click on the printoff button and do the Snap Chart and Library pages. You can do any or all of the three levels.

Round-Off Game

·  Click and read the Key ideas. On the left click on the printoff button and do the Snap Chart and Library pages. You can do any or all of the three levels.

Saloon Snap Game - Match Equivalent Numbers

·  Click and read the Key ideas. On the left, click on the printoff button and do the Snap Chart and Library pages. You can do any or all of the three levels.

Estimation Game

·  Click on the options button and try each level before you do the Mixed Practice page.

Equivalent Fractions

·  Click on the recording sheet link and print this page. You will need it to record your requests. You need to use Internet Explorer for this site.

Power of Ten

·  Changing scale by just a few powers of ten dramatically alters your perspective. Click on the Start Button.

EVALUATION

Here is how your grade will be determined.

Your grade will be divided into three different parts: 30% for your web site visit log, 30% for your worksheet, and 40% for your quiz grade.

Web Site Log – 30 points

·  Report each web site visited along with the score you earned on the game, activity, or quiz. Each site visited is worth 5 points (maximum earned 25 points)

·  Describe the view of the flowers on the Power of Ten web site from a , , and viewpoint. This is worth 5 points.

Worksheet – 30 points

·  Submit one completed worksheet from the on-line worksheets provided at the sites. Each completed worksheet or recording sheet is worth 6 points.

Quiz Grade – 40 points

·  Ten questions that are worth 4-points each.

CONCLUSION

This unit is an exciting way for you to merge math and science through technology. You have used the World Wide Web to further expand your knowledge of mathematics in real world applications. Think about how you use these different number forms in your daily life. How would life be different if you did not have all these forms from which to choose?

CREDITS & REFERENCES

Fraction, Decimal, and Percent Table: 1995 Ventura Educational Systems