A four digit number is always larger than a three digit number.
The product of a three digit number and a four-digit number cannot have more than ______ digits.
Pick a two digit number with distinct digits. Now, reverse the digits. Subtract the smaller number from the larger number. The sum of the digits of the difference obtained is always ____.
Pick a two digit number with distinct digits. Now, reverse the digits. Subtract the smaller number from the larger number. The difference thus obtained is always divisible by