You can work this out pretty quick; just assemble the number in parts. We know the number must be odd, so the last digit has to be an odd one. Let's make it three:
3
Now we need to add five more digits that collectively add up to seven (giving us the sum of ten for our six digits. There's no limit of repetition limit, so we can simply say our numbers are 1, 1, 1, 2 and 2:
111223
That's our last six digits that add up to ten. To get four different eight-digit odd numbers, all we have to do is add four combinations of two digits on the beginning:
99111223
98111223
97111223
96111223
Well, 47 49 51 53 are four consecutive odd numbers those total squared has for identical digits. 40000.... The square root of any number that is only four digits long all containing the same digit has a value that is not an integer.
1348.
There is no such number. If the four digits are even, the entire number is even, not odd.
you take the four digits and multiply 4 by 4 you get 16 digits
7777
There are four pair of mirror primes.
Well, 47 49 51 53 are four consecutive odd numbers those total squared has for identical digits. 40000.... The square root of any number that is only four digits long all containing the same digit has a value that is not an integer.
72
Find a four digit number whose digits will be reversed when multiplied by nine?
1234, 2637, 7777, 2727 are examples of a four digit number. So any random four numbers are four digits.
1348.
There is no such number. If the four digits are even, the entire number is even, not odd.
-3
61 is prime. You cannot make 61 by multiplying four digits.
Two (or four) digits added together cannot equal 42. Two-digit numbers multiplied together cannot equal 82.
you take the four digits and multiply 4 by 4 you get 16 digits
how many numbers exactly have 4 digits ? 8900, 8999, 9000, 9999