1, a four-digit number has four digits, which are thousands, hundreds, tens and units from left to right. In order to minimize this four-digit number, we need to make the highest digit (thousand digits) as small as possible, and all other digits (hundred digits, ten digits and one digit) are zero. So the smallest four digits are 1000.
2. Because the minimum value of four digits is determined by its highest bit. In this example, we need to make the most significant bit as small as possible, so it should be 1 (because 0 is not a valid number). Then, all other bits are 0, because they do not affect the size of this number. So the smallest four digits are 1000.
3. The smallest four digits are 1000, so what is the largest four digits? A: The largest four-digit number is 9999. If we rearrange a four-digit number, how many different four-digit numbers can we get? A: If you rearrange a four-digit number, you can get 24 different four-digit numbers.
4. For a 4-digit number, if its thousands and hundreds are the same, and the tens and digits are the same, how many possible values does this number have? A: When a four-digit number with thousands and hundreds is the same, there are 10 choices (0-9), and there are also 10 choices (0-9) for tens and digits. Therefore, there are * * total possible values of 10 \ multiplied by 10 = 100.
5. For a 4-digit number, if all its digits are odd or even, how many possible values are there for this number? A: When all the digits of a four-digit number are odd or even, there are two situations: all the digits are odd; At this time, five choices (1, 3,5,7,9) are thousands, and four choices (0,2,4,6,8) are hundreds.
Usage of minimum 4 digits
1, and the smallest four digits are 1000, which is usually used in mathematics or statistics. For example, when we need to describe the smallest value in a set of data, we can say "the smallest four digits are 1000".
This statement can also be used for comparison in daily life. For example, when we are discussing age, income or other figures, if we know that the value of someone or something is less than 1000, we can say "his age is less than 1000" or "his salary is less than 1000 yuan".