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The second question:

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The third question:

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The fourth question:

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This part of the extended materials mainly examines the knowledge points of counting units:

Decimal counting is commonly used. The so-called "decimal" means that the relationship between every two adjacent counting units is: one large unit equals ten small units, that is, the forward speed between them is "ten".

Counting units should include an integer part and a decimal part, which are arranged in the following order: Beijing, Gigabit, Hundred megabytes, Ten megabytes, Trillion, Billion, Million, Hundred Thousand, Hundred, Ten, One (1), One tenth, One hundredth, One thousandth, ... The integer part has no maximum value. When writing numbers, if there is a decimal part, use the decimal point (. ) to separate integers from decimals.

Counting time unit

This is the one we are most familiar with. Millisecond, second, minute, hour, day and year are counted in different units:

1 sec = 1000 ms

1 min =60 seconds

1 hour =60 minutes

1 day =24 hours

1 year =365 days (normal year) and 366 days (leap year)