You have reviewed how to add, subtract, multiply, and divide positive
numbers in the preceding lessons. This lesson will give you rules for
adding, subtracting, multiplying, and dividing when negative numbers are
One concept that is helpful when working with negative numbers is
"absolute value." Absolute value pertains to the numerical value of a
figure without regard to whether it is a positive or negative number. Using
the number line, it is the number's distance from zero without regard
whether it is to the right or left of the zero. Another way of think of
absolute value is that positive numbers stay positive and negative
numbers become positive. The symbol for absolute value is two parallel
lines with the number between the lines.
The absolute value of negative eight can be written as -8 .
If you add the absolute values of two numbers, you add the values of the
numbers without regard to whether the numbers are positive or negative.
2 + 3 = +2 + +3 = +2 + 3 = 2 + +3 = 5
The absolute value of negative five ( 5 ) is the same as the
absolute value of ____________________________ .
Rule for Addition of Two Positive Numbers
positive five ( +5 )
(1) Change both numbers to absolute values.
(2) Add their absolute values
(3) Place a positive symbol (or no symbol) in front of
Add: +5 +