Find a four digit number whose digits will be reversed when multiplied by nine?
Nine hundred thirty (930) is the highest three digit number whose digits have a sum of 12. 9+3+0=12. Any numbers higher than that will give you an sum greater than 12.
22
What is the units digit of the least whole number greater than 1000 whose digits are all different?
To find the number of three-digit positive integers with digits whose product is 24, we can break down 24 into its prime factors: 2 x 2 x 2 x 3. The possible combinations for the three digits are (2, 2, 6), (2, 3, 4), and (2, 4, 3). These can be arranged in 3! ways each, giving a total of 3 x 3! = 18 three-digit positive integers.
The largest three digit prime number whose digits are all primes is 773.
137?
992
940
How about: 773
The largest 3 digit number whose digits are all primes is 777. The largest 3 digit number with different prime digits is 753.
1348.
450 or 900
Find a four digit number whose digits will be reversed when multiplied by nine?
Nine hundred thirty (930) is the highest three digit number whose digits have a sum of 12. 9+3+0=12. Any numbers higher than that will give you an sum greater than 12.
1
There is no number. 100 is the only one that has a hundreds digit. It's impossible.