8th grade math review

Which math operation shows x divided by 4?

• 4x

• x-4

• x/4

• (x-4)/4

Tags

CCSS.6.EE.A.2A

What is the inverse operation for adding 2?

• Multiplying by 2

• Subtracting 2

• Dividing by 2

• Adding 2

Tags

CCSS.1.OA.C.6

What are the "like terms" in x + 2 = 3x -5?

• x and 2, 3x and 5

• x and 5, 3x and 2

• 3x and x, 2 and 5

• All of them are like terms.

Tags

CCSS.7.EE.A.1

What are the like terms in 2xy - 5wz = 13wz + 3xy?

• 2xy and 5wz because they are on the same side of the equation

• 2xy and 3xy only

• 13 wz and -5wz only

• 2xy and 3xy, and also 13wz and -5wz because they have the same variables

Tags

CCSS.6.EE.A.2B

2x + 3 = x + 8.

What would you do first? (There are two possible answers)

• Subtract both sides by x

• Subtract both sides by 3

• Subtract both sides by 8

• Subtract 2 from 2x

x - 2 = 5

Solve for x.

• x = 7

• x = 3

• x = 10

• x = 5/2

Answer explanation

x - 2 = 5

x -2 + 2 = 5 + 2 (add 2 to both sides)

x = 7

Tags

CCSS.6.EE.B.7

3(x + 6)

Distribute the 3.

• 3x + 6

• x/3 + 9

• x + 2

• 3x + 18

Answer explanation

Multiply 3 by x, which is the first term inside the parenthesis. Then, multiply the 3 by 6, which is the next term. The solution is 3x + 18.

Tags

CCSS.6.EE.A.3

2(x+7)

Always solve what is inside the parenthesis FIRST. What is the solution for (x + 7)?

• x + 7

• x - 7

• 7x

• x/7

Answer explanation

x and 7 are not like terms. So x + 7 is as far as you can go.

Tags

CCSS.6.EE.A.3

3(x - 1) = 9

The first step is to divide both sides by 3. What will that look like?

• x - 1/3 = 3

• [ 3 (x-1) ] / 3 = 9/3

• 3x - 1/3 = 9

• x/3 - 1/3 = 3

Tags

CCSS.HSA.REI.A.1

4x = 12

Solve for x

• x = 8

• x = 16

• x = 1/3

• x = 3

Answer explanation

Divide both sides by 4.

4x/4 = 12/4

4/4 = 1, so that leaves 1x on the left side.

12/4 = 3 on the right side of the equation.

x = 3.

Let's check:

4x = 12

4(3) = 12.

So yes, x = 3

Tags

CCSS.6.EE.B.7