The concept of negative numbers originated in India,
as did the concept of "0". Let us look at this idea.
Imagine the temperature is minus 8
as we say 8 degrees below zero) and then we receive an
inflow of heat from the south. The temperature goes
up 6 degrees (not 6 degrees above zero but just 6
degrees warmer than it was). What is the temperature now?
minus 8 degrees is written
as -8 degrees
positive 6 degrees is written as +6 degrees
the new temperature is -2 degrees
When we add numbers with different signs,
difference between the number and give the answer the
sign of the larger number.
For example -9 or -7
The + and - are call positive and negative signs and do not indicate the arithmetic operations of addition and
following 1. -14
When you add numbers with the same signs find the total of the digits and
the answer the common sign. examples +3 + (+5) = +8 this example would be written 3 + 5 = 8 without the + signs in front of the numbers.
example -7 + (-4) = -11
Remember that a number with a positive sign (+) tells that the number is greater than 0. (numbers with no signs are considered to be positive numbers)
A number with a negative sign (-) tells us that the number is less than 0.
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