Question

Using the digits one through seven to create a seven digit number that can be rounded to 6,300,000

Answer 1

Answer: 6,275,431
To round up to 6,300,000 you will definitely use 6 and 2 at the first digit. After that, you need a digit that worth above 5 so it will round up, not down. So the third digit would be 5 or 7 (since 6 is already used). After that, you could use the number freely for the last 4 digits.