Exam Review Part 1: 7th Grade Midterm

Front

What is a scale factor?

Back

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

Front

Choose the correct scale factor for enlarging a figure by 2 times.

Back

2

Front

What is 60% of 50?

Back

30

Front

How do you calculate a percentage of a number?

Back

To calculate a percentage of a number, multiply the number by the percentage (in decimal form). For example, 60% of 50 is 50 * 0.60 = 30.

Front

Fill in the missing number: 30% of 40 = ___

Back

12

Front

What is the formula to find a percentage of a number?

Back

Percentage = (Part/Whole) * 100.

Front

What happens to the coordinates of a point when it is reflected across the x-axis?

Back

The y-coordinate changes sign while the x-coordinate remains the same.

Front

Find K' if the point K(1, -4) is reflected across the x-axis.

Back

K' is (1, 4).

Front

What is a dilation in geometry?

Back

A dilation is a transformation that alters the size of a figure but not its shape, using a scale factor.

Front

State the coordinate of the image of the point B (4,9) under a dilation with center at the origin with a scale factor of 2.

Back

B' (8, 18).