PEMDAS
Explain what the acronym stands for...
Parentheses, Exponents, Multiplication, Division, Addition, Subtraction
15t
Expression
What is "x" "a" "b" "c"?
A variable
Coefficient
The number next to a variable
6(t-50)
What is an equivalent expression?
6(t-50)
=6t - 300
What is the first step in this problem?
3 x 9 + 7
3x9, Multiplication, or 3 times 9
x+5=1
Equation
What is an expression?
A group of numbers, variables, and operations (NO EQUAL SIGN).
What is a variable?
A variable is a letter that holds the spot of a number.
20 divided by (5 times 2)
2
What do you do first in a problem?
Multiply or divide?
Always go left to right/Whichever is first
5x-3y
Expression
Give an example of a constant
A number with no variable.
Example: 8, 9, 2
What does it mean to "Combine Like Terms"?
Combine all the matching variables, matching terms, and matching coefficients
t+4+3-2t
Write an expression that is equivalent
-t + 7
Solve: (50 minus 10) divided by 4 times 7
What is the first step?
(50 minus 10)
53
Expression
C = - 2
Solve: 4c - 3
-11
Equation vs Expresion
Equation has =, Expression doesn't.
3(2x+4)=18
What is the first step?
Distribute the 3!
6x+12
Create your own mnemonic device for PEMDAS (It must make sense!)
Answers will vary...
Pandas Eat Muffins During Afternoon Snacks
Pizza Every Monday Donuts After School
Penguins Enjoy Many Delicious Arctic Snacks
84=
Equation
k =20, m= -2
0.3k - 4m =
0.3(20) - 4(-2)
=14
Simplify vs Solve
Simplify means to combine any like terms & solve means to solve the equation to find value of the variable
4(x+2)=
What is the first step?
Distribute the 4!
4x+8