Grade 7 Math

Expressions

100

3x + 4y + 2x + 3y

5x + 7y

200

4(2n + 3) + 2(n + 1)

10n + 14

300

3x + 1 - 5x - 4

-2x - 3

400

4(n + 1) - 2(n - 3)

2n + 10

500

3x(2y - 3) - 3y(2x + 5)

-9x - 15y

Equations and Inequalities

100

3x + 4 = 25

x = 7

200

What symbol is this?    <

Less than

300

Write an equation:

Sami bought a drink for $1.50 and some bags of chips for $0.50 each. He spent a total of $4.00.

0.50x + 1.50 = 4.00

400

3x - 4 > 11

x > 5

500

Gia had $30 to spend at the store. If she buys a shirt that costs $11 and spends the rest of her money on $5 pins, what is the greatest number of pins she can buy?

3 pins

Proportions

100

In the equation y = kx, which letter represents the constant of proportionality?

k

200

Is it proportional?

x   y

2  10

3  15

4  20

yes

300

Is it proportional?

x   y

2  20

4  30

6  40

no

400

The graph of a proportion must have what two things?

straight line through the origin (0, 0)

500

What is another term for the constant of proportionality?

unit rate

Percents

100

What is the decimal equivalent to 15%

0.15

200

What is 20% of 80?

16

300

What expression is the same as a 15% discount?

0.85x

400

What is the percent increase from 24 to 30?

25%

500

A shirt that normally costs $45 is on sale for 25% off. What is the final price of the shirt?

$33.75

Circles

100

The radius of a circle is 5 inches. What is the length of the diameter?

10

200

The radius of a circle is 5 inches. What is the length of the circumference in terms of pi?

10pi

300

The radius of a circle is 5 inches. What is the area of the circle in terms of pi?

25pi

400

The circumference of a circle is 22pi inches. What is the radius of the circle?

11 inches

500

The area of a circle is 100pi square centimeters. What is the length of the diameter?

20 centimeters