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To give the particular number the largest possible value, arrange the digits in the order of their individual value, beginning with the largest one on the left and smallest on the right. To give the particular number its smallest possible value, arrange the digits in the order of their individual value, beginning with the smallest one on the left and largest on the right.
For this type of "the largest number which..." questions, you need to advance from left to right, using the largest possible digit in each case. For the first two digits, that would be 9, for the third digit (the right-most digit), the largest digit which will make this possible is an 8.
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Front end rounding is to the largest place. Since the number to the right of that is less than 5, we zero it and everything to the right of it out. Answer: 10,000
No, there is no largest prime number. Also 57 is not a prime.No, there is no largest prime number. Also 57 is not a prime.No, there is no largest prime number. Also 57 is not a prime.No, there is no largest prime number. Also 57 is not a prime.