Adding Numbers with signs
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How do you add two numbers with the same sign?
 Add the absolute values of the numbers. The sum has the same sign as the given numbers.
 Example: 4 + (3) = 7

How do you add numbers with different signs?
 To add two numbers with diffrent signs, find the absolute values of the numbers and subtract the smaller absolute value from the larger. Give the answer the sign of the number having the larger absolute value.
 Example: 12 + 6 = 6
 Example: For instance, to add 12 and 5;
 12 = 12 and 5 = 5
 Then find the diffrence between these absolute values: 12  5 = 7 ; The sum will be negitive, since12 > 5
 12 + 5 = 7

Definition of subtraction.
 For any real numbers x and y,
 x  y = x + (y).
 That is, to subtract y from x, add the additive inverse (or oppiste) of y and x.

Adding Signed Numbers
Same sign Add the absolute values of the numbers. The sum has the same sign as the given numbers.
Different sign Find the adsolute values of the numbers and subtract the smaller absolute value from the larger. Give the answer the sign of the number having the larger absolute value.