Unit Test: Scaling and Proportions

Front

What is percent change?

Back

Percent change is the difference between the new value and the old value, divided by the old value, multiplied by 100. It shows how much a quantity has increased or decreased in percentage terms.

Front

How do you calculate percent change?

Back

Percent Change = ((New Value - Old Value) / Old Value) x 100

Front

What is a scale factor?

Back

A scale factor is a number that scales, or multiplies, some quantity. It is used to enlarge or reduce figures in geometry.

Front

If a scale factor is greater than 1, what happens to the figure?

Back

The figure is enlarged.

Front

If a scale factor is less than 1, what happens to the figure?

Back

The figure is reduced.

Front

What are corresponding sides?

Back

Corresponding sides are sides that are in the same position in different shapes or figures.

Front

What is the scale factor from figure C to figure A if the sides of A are twice as long as those of C?

Back

The scale factor is 2.

Front

What is the scale factor from figure A to figure C if the sides of A are half as long as those of C?

Back

The scale factor is 1/2.

Front

How do you find the new length of a side when applying a scale factor?

Back

New Length = Original Length x Scale Factor.

Front

What does it mean if two figures are similar?

Back

Two figures are similar if they have the same shape but not necessarily the same size, and their corresponding sides are in proportion.