9.9 Sec 1.2 Review 7th Grade Algebra

9.9 Sec 1.2 Review 7th Grade Algebra

by Laura Plasschaert

​PEMDAS

​Let's review the order of operations!

• ​Parenthesis or grouping symbols

• ​Exponents

• ​Multiplication OR division, whichever comes first from left to right

• ​Addition OR subtraction, whichever comes first from left to right

​Let's practice

• Start with parenthesis

  • ​7 x 6 + 11

• ​Mulitiplication

  • ​42 + 11

• ​Add

  • ​53

Fill in the Blanks

Use PEMDAS to solve:

10 - 2 +15 ÷ 3

Fill in the Blanks

Use PEMDAS to solve:

18 ÷ 9 + 7 x 10

Fill in the Blanks

Use PEMDAS to solve:

( 9 + 3 ) + 14 ÷ 7

Fill in the Blanks

Solve using PEMDAS:

( 8 +23 - 3 ) ÷ 4

​Substitution

​Remember, you need to remember to insert the correct value for the variable in the equation.

​Let's practice

• ​First, rewrite the problem.

• ​Then, replace the d value with 2

• ​The new problem should be 2+9(2)

• ​Solve following PEMDAS

• ​2+18

• ​20

Fill in the Blanks

Use w = 4 and solve:

-4w - 9 - 2 + 7w

Fill in the Blanks

Use n = 7 and solve:

3 - 7n + 9n

Fill in the Blanks

Use x = 7 and solve:

3(-6x + 4)

Fill in the Blanks

Use k = 9 and solve:

4 - 5(-2 + 3k)