Lesson 6

recipe.pngFormulas in math are like recipes. 

When you follow a recipe that calls for 2 cups of sugar, you add in 2 cups of sugar not 2 cups of carrots.  When you use a formula that calls for multiplying the base of a shape times the height, you need to make sure that you put in the correct number in for the base and the correct number in for height.  This week you will be using lots of formulas.  Each one has been created for a different purpose.  It will be your job to know which formula to use.  The formulas range from finding perimeter and area of polygons, to converting temperatures, to calculating the surface area of a sphere.  Make sure you pick out the correct formula to use.  Just like if you are making a special birthday dinner, you want to pick out just the right recipe to use.  You wouldn’t use the recipe for making potato salad when you are trying to make garlic mashed potatoes.  You don’t have to memorize the formulas in this unit; however, you need to know how to use them.

Your textbook has each formula written out with a description of what each part of the formula stands for.  If you need help understanding the formulas, view the following tutorial below.  I will walk you through the pages in the book with the formulas to explain what they mean and provide examples of how to use them.  You also have the option of reading the presentation in this PDF file.  (Common Geometric Formulas – Examples)


Before you attend the Gathering Meeting, you will want to study pages 73 & 74 in your textbook.  These pages provide an explanation on how to combine-like-terms, simplify expressions and use the distributive property.  You are also welcome to view this tutorial to help you with these concepts.


Some students have struggled with finding the value of a pile of coins; especially, if a variable is used to represent the quantity of some of the coins.  Watch this tutorial to find out how to work through those problems.


If you need additional practice beyond what is in the textbook, print off the following worksheets & answer keys: Calculate Area of Mixed Shapes, Calculate Area and Circumference of Circles, Calculate Volume and Surface Area of Rectangular Prisms, Calculate Volume and Surface Area of Cylinders, Calculate Volume and Surface Area of Cones, Calculate Volume and Surface Area of Spheres, Pythagorean Theorem Extra Practice Worksheet, Calculate Temperature Conversions, Distance Rate Time Extra Practice Worksheet and Compound Interest Wkst.