Digital introduction:
Refers to the position occupied by each number in a number. The number of digits in the integer part starts from the right, and every four digits are one level, and each level includes one digit, ten digits, hundred digits and thousand digits, indicating how many ones there are;
Tens of thousands include tens of thousands, hundreds of thousands, millions and tens of millions, indicating how many tens of thousands there are; Billions include hundreds of millions, billions, tens of billions and hundreds of billions, indicating that billions ... Decimal numbers are deciles, percentiles and thousandths from left to right ... indicating tenths, percentiles and thousandths. ...
The number of digits of a natural number is called the number of digits. For example, the number 9 contains only one number, so 9 is a number; Five digits 12345 contains five digits: one, ten, hundred, thousand and ten thousand.
Distinguish concepts:
Number:
Numbers refer to the position occupied by each digit of a number. From the right, the first digit in the numerical sequence table is "unit", the second digit is "ten digits", the third digit is "hundred digits", the fourth digit is "thousand digits", the fifth digit is "ten thousand digits", and so on.
The same number represents different values because of different digits. For example, if Arabic numerals are used to represent numbers, the same' 6' in the tenth place is six tens, in the hundredth place is six hundred, in the hundredth place is six hundred, and in the hundredth place is six hundred million.
Number of digits:
Number of digits refers to the number of digits contained in natural numbers. Numbers like 458 are composed of three numbers, each of which occupies one place, so we call it three digits. 198023456 consists of nine digits, so it is nine digits. "Numbers" and "digits" cannot be confused.
Counting unit:
One, ten, one hundred, one thousand, ten thousand, one hundred thousand, one million, ten million, one billion, ten billion, one hundred billion ... are all units of counting. The counting unit on "unit" is "one", the counting unit on "ten" is "ten" and the counting unit on "hundred" is "hundred", so look at the numbers first and then look at the counting unit.