5.2.6 Working with Negative Numbers

Activity symbol Activity: Working with Negative Numbers

Let’s try the following examples. You can try this using pencil and paper, or click here [Tip: hold Ctrl and click a link to open it in a new tab. (Hide tip)] for an interactive number line! Note that all these calculations involve adding or subtracting a positive number.

(a) three minus seven

Solution symbol

Answer

Start at 3, move 7 units to the left.

Thus, equation left hand side three minus seven equals right hand side four minus.

(b) two minus plus five

Solution symbol

Answer

(b) Start at 2, move 5 units to the right.

Thus, two minus plus five equals three.

(c)three minus minus six

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Answer

(c) Start at 3, move 6 units to the left.

Thus, equation left hand side three minus minus six equals right hand side nine minus.

(d) four minus plus two

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Answer

(d) Start at 4, move 2 units to the right.

Thus, equation left hand side four minus plus two equals right hand side two minus.

Now let’s look at adding and subtracting negative numbers.

5.2.5 Addition and Subtraction on the Number Line

5.2.7 Adding and Subtracting Negative Numbers