Question

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

• A. 8
• B. 5
• C. 7
• D. 12

Answer 1

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.