Fourth Periodical Test in Math 7

The bar model below represents the equation 𝑥 + 5 = 12. What is the value of 𝑥?

• 7

• 3

• 5

• 12

A bar model represents the equation 2𝑥 = 10. What is the value of 𝑥?

• 4

• 5

• 6

• 8

Arlen used a bar model to solve 𝑥 − 3 = 8. What should she do to find 𝑥?

• Add 3 to both sides

• Subtract 3 from both sides

• Multiply both sides by 3

• Divide both sides by 3

A bar model shows a total of 18 divided into three equal sections labeled '𝑥.' What equation represents the model?

• 𝑥 + 3 = 18

• 3𝑥 = 18

• 𝑥 ÷ 3 = 18

• 18𝑥 = 3

In the expression 5𝑥 + 7, which is the variable?

• 5

• 7

• 𝑥

• +

Which of the following is a constant in the expression 3𝑎 + 2𝑏 − 4?

• 3

• 2

• 𝑎

• -4

Which of the following contains only variables?

• 𝑎 + 7

• 9𝑏 + 3

• 4𝑧 + 5

• 𝑥 − 𝑦

Which of these correctly describes a variable?

• A fixed number

• A letter representing a number that can change

• A mathematical symbol

• The result of an equation

If 𝑥 = 3, what is the value of 2𝑥 + 5?

• 6

• 8

• 11

• 13

Given 𝑎 = 4 and 𝑏 = 2, evaluate 3𝑎 − 𝑏.

• 6

• 10

• 12

• 14