19.99 rounded to the nearest hundreds place is zero.
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Yes, of 1 since 1 x 1999 = 1999. Other than 1 and 1999, no since 1999 is a prime.
1999 + 1000 = 2,999
1999 is prime1999 is already prime.
N/A - 1999 is a prime number.
To determine how many times the digit 9 is written when writing numbers from 1 to 10000, we can consider the pattern of its occurrence in each place value. In the units place, the digit 9 appears 1000 times (from 9 to 9999). In the tens place, the digit 9 appears 1000 times (from 90 to 99, 190 to 199, and so on). In the hundreds place, the digit 9 appears 1000 times (from 900 to 999, 1900 to 1999, and so on). Therefore, the digit 9 is written 3000 times in total when writing numbers from 1 to 10000.