How to Use Number Lines for Multiplication by a Negative Integer?

• Count the number of negative signs.
• If the number of negative signs is even, then the result is positive.
• If the number of negative signs is odd, then the result is negative.

Using Number Lines for Multiplication by a Negative Integer – Examples 1

Solution:

Using Number Lines for Multiplication by a Negative Integer – Examples 2

Use this formula to find the sign of the product:
(negative)\(×\)(positive)\(=\)negative
To graph \(4×-3\):
Step 1: Start from \(0\).
Step 2: Jump \(3\) units to the left side \(4\) times.
Step 3: The last jump ends at \(-12\).

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