Proportions

Tutoring on Proportions

Learning Objectives:

Understand and Apply Proportions.

Math Tutoring on Proportions

Proportion is a mathematical statement that two ratios or two rates are equal. If  are two equal ratios, then  is a Proportion.

  if and only if .

If two fractions are equal, then the cross products are equal. If cross products are equal, then the fractions are equal.

Procedure to solve for a missing number in a Proportion:

1.    Find the cross products and form an equation.

2.    Solve the equation.

3.    Check the answer.

Unit Scale:

Unit Scale is a ratio that compares the dimensions of a scaled object to the actual dimensions of an object.

Scale Factor:

Scale Factor is a ratio comparing the scaled measurement to the actual measurement. Scale Factor is similar to a Unit Scale except no units are given.

 

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Hook Questions:

1.    What are Proportions?

2.    How do you find a missing number in a Proportion?

3.    What are Unit Scale and Scale Factor?

 

 

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