In this lesson on algebra negative numbers are covered. Get information and negative numbers practice here.
There are two rules for multiplying and dividing numbers:
That's it! You multiply or divide as normal, then use these rules to determine whether the answer is positive or negative. For instance, take this problem, -3 ⋅ -4. 3 ⋅ 4 is 12. Because both numbers we multiplied were negative, the answer is positive: 12.
-3 ⋅ -4 = 12
On the other hand, if we were to multiply 3 ⋅ -4, we'd get a different answer:
3 ⋅ -4 = -12
Again, 3 ⋅ 4 is 12. But because one of our multiples is negative and the other is positive, our answer must also be negative: -12.
It works the same way for division. -40 / -10 is 4 because -40 and -10 are both negatives. However, -40 / 10 is -4 because one number is negative and the other is positive.
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