Transcript Integers: Multiplication & Division

Integers: Multiplication & Division
Lesson 1b
Multiplication of Integers
• When you multiply two or more numbers the
result is called the product.
• There are two rules that you must know when
multiplying integers:
 When multiplying two numbers with the same
sign, the product is positive.
 When multiplying two numbers with different
signs, the product is negative.
Multiplication of Integers
When multiplying two numbers with the same
sign, the product is positive.
When multiplying two numbers with different
signs, the product is negative.
The following examples
apply to rule #1:
3(6) = 18
-3(-6) = 18
The following examples
apply to rule #2:
3(-6) = -18
-3(6) = -18
Examples
 When multiplying two numbers with the same sign, the product is
positive.
 When multiplying two numbers with different signs, the product is
negative.
• Which rule above applies to the following examples? Choose
the correct answer below.
1) 5•6 = 30
5) 7•(-3) = -21  or 
 or 
2) -5•6 = -30
3) -6(-5) = 30
4) 5•(-6) = -30



or
or
or



6) -3(-7) = 21
7) 7•3
= 21
8) (-7)•3 = -21



or
or
or



Summary of Multiplication
 When multiplying two numbers with the same sign, the product is
positive.
 When multiplying two numbers with different signs, the product is
negative.
• A positive number multiplied by a positive number
is positive.
• A negative number multiplied by a negative
number is positive.
• A positive number multiplied by a negative
number is negative.
Division of Integers
• When you divide two or more numbers the
result is called the quotient.
• There are two rules that you must know when
dividing integers:
When dividing two numbers with the same sign,
the quotient is positive.
When dividing two numbers with different signs,
the quotient is negative.
Division of Integers
When dividing two numbers with the same sign,
the quotient is positive.
When dividing two numbers with different signs,
the quotient is negative.
The following examples
apply to rule #1:
27
9
3
 27
9
3
The following examples
apply to rule #2:
 27
 9
3
27
 9
3
Examples
When dividing two numbers with the same sign, the
quotient is positive.
When dividing two numbers with different signs, the
quotient is negative.
• Which rule above applies to the following examples?
Choose the correct answer below.

48
48
3)
 4  or 
1)
 4  or 
12
 12
 48
2)
4
 12

or

48
4)
4
12

or
