Proportions. Skill Maintenance Page 61 Commutative Property Addition  3 + 4 = 4 + 3  5 + 17 + 43 = 17 + 43 + 5 Multiplication  3 * 4 = 4 * 3  2 *

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Presentation transcript:

Proportions

Skill Maintenance Page 61

Commutative Property Addition  =  = Multiplication  3 * 4 = 4 * 3  2 * 7 * 8 = 8 * 2 * 7

Substitution Important concept when working with variables Substitution: Replace a variable with a number value

Ratios Ratio: Compares two numbers –Represent a part-to-whole relationship –Represent a part-to-part relationship Fraction is a special type of ratio (part-to-whole)

Variables in Formulas One of the most powerful uses of variables in formulas. We use substitution to replace the values we know. Variables and formulas help solve problems in geometry.

Proportions Proportion: Two ratios that are equal Work for multiplication type ratios

Apply Skills Page 62

Word Problems with Proportions

Read the problem

What is the problem asking?

What do we Know?

Problem Solving Activity Page 63

Homework Pages 163 All Activities All Problems