The greatest number in one of the fact families is $81.$ Another number in this same family is $9.$ What is the relationship of the unknown number with $9 ?$

Less than

9

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Equal to

9

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Greater than

9

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Cannot be determined

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Solution

The correct option is B Equal to $9$

Let the unknown number be $“ k ” .$
Since $81$ is the greatest number, it must be the product of the unknown number and $9.$
$k \times 9 = 81$
$k = 81 \div 9 = 9$
$k = 9.$
The unknown number is equal to $9.$

Hence, option B is correct.

Suggest Corrections

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