Scale Factors in Drawings

Mrs. Zia's lesson 13 focuses on understanding and calculating scale factors between drawings. Students learn to determine scale factors, differentiate between reductions and enlargements, and verify conjectures. The lesson emphasizes converting scale factors to percentages and understanding reciprocal relationships.

What is the main focus of lesson 13?

• Learning about fractions

• Understanding geometric shapes

• Changing scales and calculating scale factors

• Exploring algebraic expressions

How is the scale factor between two drawings expressed?

• As a sum

• As a product

• As a quotient

• As a difference

What is the scale factor from drawing one to drawing two if the length of the scale drawing is 3.92 and the original is 2.45?

• 80%

• 100%

• 160%

• 120%

If a scale factor is greater than 100%, what does it indicate?

• No change

• A reduction

• An enlargement

• A rotation

What is expected when comparing drawing two to drawing one if drawing two is larger?

• The scale factor will be greater than 100%

• The scale factor will be less than 100%

• The scale factor will be exactly 100%

• The scale factor will be negative

What is the scale factor from drawing two to drawing one if the original is 3.92 and the scale drawing is 2.45?

• 80%

• 62.5%

• 100%

• 160%

What is the process to find the scale factor from drawing two to drawing one if the scale factor from one to two is 60%?

• Subtract 60% from 100%

• Multiply by 60%

• Add 60% to 100%

• Divide 100% by 60% and multiply by 100

What is the scale factor from drawing two to drawing one if the scale factor from one to two is 60%?

• 100%

• 166.67%

• 60%

• 50%

What is the first skill learned in this lesson?

• Solving algebraic equations

• Calculating areas

• Computing the scale factor from given lengths

• Drawing geometric shapes

What is the procedure to find the scale factor from drawing two to drawing one?

• Subtract the scale factor from 100%

• Add the scale factor to 100%

• Divide 100% by the scale factor and multiply by 100

• Multiply the scale factor by 100