Adding and Subtracting Integers
Integers can be positive or negative numbers. Adding positive integers
is relatively straightforward.
Adding With Negative Integers
Think of a situation where one person has six dollars and the other
owes (or was in debt) two dollars. If they got together, what is the
total amount of money they have between them?
Adding To a Negative Integer
The example above shows adding a positive integer to a negative integer
by moving to the right on a number line.
Adding a Negative Integer
The example below shows adding a negative integer to a positive integer
by moving to the left on a number line.
More Examples of Adding With Negative Integers
Subtracting With Negative Numbers
Subtracting From Negative Integers
When subtracting positive numbers using a number line we move to the
left on the line.
Subtracting Negative Integers
When subtracting negative numbers we move to the
right. Moving to the left by a negative number is the same as moving
to the right by the opposite positive number.
Changes in Temperature
Depending where you live you might experience temperatures below zero
degrees. In such cases integers are useful for showing temperature
and changes in temperature. For example, if the temperature during
the day is 16 degrees and overnight it falls to -9 degrees, by how
much did the temperature change?
Try these worksheets: