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Directed numbers are numbers which are either positive or negative.

Directed numbers can be added and subtracted together just like normal positive integers - signs, however, become very important because each directed number has its own positive or negative sign.

It is helpful to use a number line to add and subtract directed numbers.

There are three steps to adding and subtracting directed numbers:

Step 1: Find the starting position on the number line - this will be the first number in the calculation.

Step 2: Identify the direction of travel on the number line - this is determined by the signs that appear in the calculation.

If two adjacent (next to each other) signs are the same, then they equal a positive.

For example, 8 - (-8) = 8 + 8
= 16

If two adjacent signs are different, then they equal a negative.

For example, 8 + (-8) = 8 - 8
= 0

Step 3: Move the number of places on the number line required by the calculation - this will be the second number in the calculation.

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Question 1/5

1. Pick the TRUE number sentence.

 24 - (-34) = -10 22 - (-18) = 4 12 - (-6) = 18 18 - (-12) = 6

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