Fundamentals of Math - old

Fundamentals of Mathematics

Multiplying and Dividing Integers We can multiply and divide integers together using a number line. For example, (3)(−2)

Starting at 0 , the first number (3) tells you how many jumps to make. The second number (−2) tells you how big your leap is. Then use the chart below to determine the final sign of your answer and which direction to leap on your number line (left for negative or right for positive).

Figure 1.4.2 The Product of Signs

Sign of the 2 nd Number Positive Negative

Positive (+)(+) + Negative (−)(+) −

Negative (+)(−) − Positive (−)(−) +

Positive

Sign of the 1 st Number

Negative

Tip:

Same Signs = POSITIVE Opposite Signs = NEGATIVE

Therefore, we can conclude (3)(−2) is equal to −6 .

Figure 1.4.3 Multiplying Integers on a Number Line

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