8th Grade Equations

One Step Equation

100

x + 10 = 25

X = 15

200

x - 15 = 20

X = 35

300

-15 + x = 20

35

400

2x = 12

X = 6

500

1/2x = 5

X = 10

2 Step Equation

100

2x + 5 = 9

x = 2

200

5x - 10 = 25

x = 7

300

1/2x + 4 = 6

x = 4

400

10x + 20 = 30 

x = 1

500

20x - 40 = 60 

x = 5 

Multi Step Equation

100

5x + x - 12 = 12

x = 4 

200

10x + 10 + 10 = 40 

X = 2

300

2x + 3x + 10 = 40

x = 6

400

50x  - 10 = 50 + 20x

x = 3

500

1/2x + 10 = 1/2x +10 

x = 0 

Staar Questions

100

What is -13, 23, 250, 0, -12?

A. Integer

B. Natural Numbers

C. Whole Numbers

A. Integer

200

The volume of salt water on Earth’s surface is approximately 350,000,000,000,000,000,000 gallons. How is this number written in scientific notation?

 A 3.5 × 1016 

B 3.5 × 1020

C 35 × 1016 

D 35 × 1020

B

300

An online candy store sells 3 pounds of fudge for $54.99. Which function represents the relationship between x, the number of pounds of fudge ordered, and y, the total cost in dollars?

A    y = 3(54.99)x 

B    y = 54.99 3 x 

 

B

400

Which equation does NOT show a proportional relationship between x and y? 

C y = 2 3x 

D y = 7x – 9

D

500

Ms. Avery sold tomatoes at a local farmers’ market over a two-week period. • She sold 4.8 pounds of tomatoes on each of 3 days during the first week. • She sold 5.6 pounds of tomatoes on each of 4 days during the second week. How many pounds of tomatoes did Ms. Avery sell during the two-week period? 

B     10.4 lb 

C     36.8 lb 

 

C

All Operations Problems

100

500 + 1000 = 

1500

200

1000 - 500 = 

500

300

-20 x -50 = 

100

400

500/-10 = 

50

500

5(2 + 3) - 10 = 

15