Fill in the missing number:
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Fill in the missing number:
Remember the following law:
Let's think about which number we need to multiply by 3 to get 9:
Now let's put the numbers together with the appropriate sign as written in the law above as follows:
What will be the sign of the result of the next exercise?
\( (-2)\cdot(-4)= \)
Great question! Remember that (-3) × (+3) = -9. The negative and positive multiply to give a negative result. If we used -3 instead, we'd get , which is wrong!
Use this simple pattern: same signs = positive, different signs = negative. So (+) × (+) = (+), (-) × (-) = (+), but (+) × (-) = (-) and (-) × (+) = (-).
Never ignore the signs! They're part of the number and change the entire answer. Always work with the complete numbers, including their signs, from the very beginning.
Think of it as division! If (-3) × ? = -9, then ? = (-9) ÷ (-3). Dividing -9 by -3 gives you +3 because you're dividing two negatives.
Always substitute back! Take your answer and multiply: . If you get the original right side (-9), you're correct! ✓
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