Unit 4 Semester Review

Add or subtract first

Multiply or divide second

Keep Change Flip when Dividing Fractions

• 11

Answer explanation

7/9 = 2/3x - 7

+7 +7

7 7/9 = 2/3x

Turn 7 7/9 into an improper fraction

70/9 = 2/3x

Divide 2/3 on both sides. When dividing fractions, keep change flip

70/9 x 3/2 = 210/18

18 goes into 210 11 times with 12 left over

11 12/18 can be simplified into 11 2/3

Tags

CCSS.7.EE.B.4A

When adding fractions, make the denominators the same

Answer explanation

1/3x - 6 + 8/12x = 12

4/12x - 6 + 8/12x = 12

4/12x + 8/12x = 1x

x - 6 = 12

+6 +6

x=18

Tags

CCSS.8.EE.C.7B

What does sum mean?

• A

• B

• C

• D

Answer explanation

h + 8 = 2

-8 -8

H=-6

Tags

CCSS.6.EE.B.7

Use Inverse (opposite) operations to isolate the variable (x).

• A

• B

• C

• D

Answer explanation

x/5 - 2 = 8

+2 +2

x/5=10

x5 x5

x=50

Tags

CCSS.7.EE.B.4A

Rainbow method then isolate the variable by using inverse operations.

• a

• b

• c

• d

Answer explanation

2(m-6)=8

2m-12=8

+12 +12

2m=20

/2 /2

m=10

Tags

CCSS.7.EE.B.4A

What is the special rule?

• a

• b

• c

• d

Answer explanation

-3x > 3.3

/-3 /-3

x < -1.1

You have to flip the inequality sign when multiplying or dividing with a negative number.

Tags

CCSS.6.EE.B.8

Inverse Operations. What is x?

Answer explanation

4x=-24

/4 /4

x=-6

Tags

CCSS.6.EE.B.7

What is h?

Answer explanation

h/5 = 4

x5 x5

h=20

Tags

CCSS.6.EE.B.7

What is k?

Answer explanation

12=k-4.3

+4.3 +4.3

16.3=k

Tags

CCSS.6.EE.B.7

Add or subtract first

Multiply or divide second.

Answer explanation

3y-6=18

+6 +6

3y=24

/3 /3

y=8

Tags

CCSS.7.EE.B.4A