Addition
Mental Math
-7 + -13
-20
MENTAL MATH
5-1
4
MENTAL MATH
2 x -4
-8
MENTAL MATH
25 / -5
-5
What does each letter of PEMDAS stand for?
Parenthesis
Exponents
Multiplication / Division
Addition / Subtraction
Mental Math
50+25+(-10)
65
MENTAL MATH
10-60
-50
MENTAL MATH
-9 x -5
45
MENTAL MATH
-400 / -5
80
List the order of the operations you would perform to solve the following problem:
3 + (2-9) x (-4)
1. Parenthesis
2. Multiplication
3. Addition
Mental Math
-5 + 3
-2
MENTAL MATH
-9-12
-21
MENTAL MATH
-13 x 3
-39
MENTAL MATH
-56 / 7
-8
List the order of the operations you would perform to solve the following problem:
(-5)2 / (3 x -2)
1. Parenthesis
2. Exponent
3. Division
What is the rule for adding two numbers with the same sign?
Add the numbers, keep the sign.
MENTAL MATH
-5 - (-7)
2
When multiplying 2 number with the same sign, what do we know about the product?
Product is positive!
MENTAL MATH
140 / -20
-7
MENTAL MATH
3 + (2-9) x (-4)
31
What is the rule for adding 2 numbers with opposite signs?
Subtract the numbers, take the sign of the larger number.
How can we change every subtraction problem to addition?
Keep, change, opposite!
When multiplying 2 number with opposite signs, what do we know about the product?
Product is negative!
Are the rules for division the same as the rules for multiplication? What are the rules?
Yes!
Same signs = positive
Opposite signs = negative
MENTAL MATH
(-5)2 / (5 x -2) SIMPLIFY
25 / -10 or -25 / 10
which simplifies to:
5 / -2 or -5 / 2