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Number sequence table of the first volume of fourth grade mathematics
The first volume of the fourth grade is listed as follows:

Units, ten, hundred, thousand and ten thousand are all numbers.

One (a), ten, one hundred, one thousand, ten thousand ... are all counting units.

According to our country's counting habit, every four digits from the right are divided into one level: level one, level ten thousand and level one hundred million.

The counting method with the forward speed of 10 between every two adjacent counting units is called decimal counting method.

Exercise questions:

Numbers 1 and 800500600 are () digits, and its highest digit is () digits. "8" means 8 (), "5" means () () and "6" means ().

2. In the numerical sequence table, from the unit point of view, 10,000 bits are () bits and 100 million bits are () bits.

3. The two counting units adjacent to "million" are () and () respectively. The two digits adjacent to the "hundred digits" are () and () respectively.

4. The highest digit of six digits is (); The highest number of 10 million digits is () digits.

5. 10 is (), 10 is (), 10 is (). 10 billion is (), 10 () is10 billion.