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Largest and Smallest Possible Number

The product o...

Question

The product of a three digit number and a four-digit number cannot have more than ______ digits.

A

8

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B

5

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C

7

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D

12

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Solution

The correct option is C
7

The product of largest 3 digit number and 4 digit number $999 \times 9999 = 9989001$
So the product of any three-digit number and a four-digit number cannot have more than 7 digits.

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