Adding Integers on a Number Line

Addition problems can be solved easily using the number line.

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Example: -1 + (-1) = -2

The first integer is the starting point of the model and the second integer would serve as the number of units you will move from the first number. The direction of the movement depends on the sign of the second number. If the second number is NEGATIVE the movement is towards to the left. If the second number is POSITIVE, the movement is towards to the right of the first number.

Adding integers using the number line

​The sum of two positive integers is a POSITIVE INTEGER.

5 + 6 = 11

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​The sum of two negative integers is a NEGATIVE INTEGER.

-5 + (-6) = -11

​To find the sum of a positive and a negative integer , subtract them and reflect the sign of the number with bigger absolute value.

5 + (-6) = -1

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