Fill in the missing number:
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Fill in the missing number:
Let's remember the law:
Let's think about which number we need to multiply by 10 to get 100:
Now let's put the numbers together with the appropriate sign as written in the law above as follows:
Convert \( \frac{7}{2} \)into its reciprocal form:
Since we need a negative product (-100) and we're multiplying by a positive number (10), the missing number must be negative. Remember: positive × negative = negative!
Use this simple pattern: Same signs make positive, different signs make negative. So (+10) × (-10) = -100 because the signs are different.
Check your work! If you multiply 10 × 10, you get +100, not -100. The problem asks for , so you need the negative version.
Yes! Think about it as division: . This confirms that -10 is the correct missing number.
Actually, it doesn't for multiplication! Both and equal -100. Multiplication is commutative with signs too.
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