1, counting unit: (1) Function: the size of the measured number.
(2) The counting units learned are (in descending order): one, ten, hundred, thousand, ten thousand, one hundred thousand, one million, ten million, one billion, one billion, one billion, one billion. (3) 10 is ten, 10 is one hundred, 10 is one thousand, 10 is ten thousand, 10 is one hundred thousand, one hundred thousand is one million, one million is ten million, and one million is one hundred million. (4) The propulsion rate between two adjacent counting units is 10.
2. Numbers: (1) The position occupied by each number is called a number. (2) digital sequence table:
...... hundreds of billions of billions of billions of billions of billions of billions of billions of billions of billions of billions of billions of billions of billions of billions of billions of billions of billions of billions of billions of billions of billions of billions of billions of billions of billions of billions of billions of billions of billions of billions of billions of billions of billions of billions of billions of billions of billions of billions of billions of billions of billions of billions of billions of billions of billions of billions of billions of billions of billions of billions of billions of billions of billions of billions of billions of billions of billions of billions of billions of billions of billions of billions of billions of billions of billions of billions of billions of billions of billions of billions of billions of billions of billions of billions of billions of billions of billions of billions of billions of billions of billions of billions of billions of billions of billions
(3) Remember the important figures: the fifth place from the right is 10,000, and the ninth place is 100 million.
(4) Series: starting from one digit, every four digits are one level, followed by: series (one digit, ten digits, hundred digits, thousand digits), indicating how many ones there are; Ten thousand (ten thousand, one hundred thousand, one million, ten million), which means tens of thousands; Billion (one billion, one billion, one billion, one billion) means how many billions.