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Year 8 Interactive Maths - Second Edition


Multiplication of Integers

The Product of Two Positive Integers

Consider the product 3 4.


This suggests that:

The product of two positive integers is a positive integer.


Example 10

Find the value of:

Solution:


The Product of Two Negative Integers

Consider the product 3 4.


This suggests that:

The product of two negative integers is a positive integer.


Example 11

Find the value of:

Solution:


The Product of a Positive Integer and a Negative Integer

Consider the product 4 3.


This suggests that:

The product of a positive integer and a negative integer is a negative integer.


Example 12

Find the value of:

Solution:


Just to recap the foregoing discussion:
  • The product of two numbers with like (i.e. the same) signs is always positive.
  • The product of two numbers with unlike (i.e. different) signs is always negative.

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