1, 10 ten thousand is one hundred thousand, 10 ten thousand is one million, 10 one million is ten million, 10 ten million is one hundred million. 10 billion is one billion, 10 billion is ten billion, and 10 billion is one hundred billion.
2. In the numerical sequence table, from right to left, every four digits are one level, that is, one level, ten thousand levels and one hundred million levels. The two digits adjacent to ten thousand digits are thousand digits and one hundred thousand digits respectively. The two digits adjacent to the billion bits are ten million bits and one billion bits respectively.
3. How to read numbers within 100 million: read 10,000 levels first, and then read another level. Ten thousand series should be read according to the pronunciation of ten thousand series, and then a ten thousand word should be added at the end. No matter how many zeros are at the end of each level, they will not be read. Other numbers have one or several zeros in succession, and only one zero is read.
4. How to write the number within 10,000: write 10,000 levels first, and then write one level. If there is no unit on any number, write 0 on that number.
5, compare the size of the number within 100 million: the number with more digits, this number is large. Two numbers with the same number of digits, starting from the high position, the one with the largest number of digits is larger. If the highest digit is the same, compare the next digit.
6. Number in "ten thousand": omit the mantissa after ten thousand and rewrite it into a number in ten thousand, depending on the number in thousands, and then round it off.
7. The method of finding the divisor is called "rounding method", and whether it is "rounding" or "decimal" depends on whether the highest digit of the omitted mantissa part is less than 5 or equal to or greater than 5.
8. 1 2 3 4 5 6 All the objects are natural numbers. There is no object, which is represented by 0, and 0 is also a natural number. All natural numbers are integers. The smallest natural number is 0. There is no maximum natural number, and the number of natural numbers is infinite.
9. The forward speed between every two adjacent counting units is 10. This counting method is called decimal counting method.
10 and the pronunciation of over 100 million: grade one, then read from the top, add the word "100 million" after reading 100 million numbers, and add the word "10,000" after reading 10,000 numbers. The zeros at the end of each level are not read, and there are several zeros in the middle, all of which are read only.