You are leaving out some crucial information. Numbers can be rounded to any selected power of 10.
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The rounded number of 299,792,458 would be 300,000,000. When rounding to the nearest million, we look at the digit in the millions place, which is a 2 in this case. Since 2 is less than 5, we do not round up the number. Therefore, 299,792,458 rounded to the nearest million is 300,000,000.
Oh, what a wonderful question! Let's take a moment to appreciate the beauty of these numbers. When we multiply 31536000 by 299792458, we get the result of 9.45 x 10^15. Isn't that just a happy little calculation? Remember, there are no mistakes in math, just happy little accidents.
51...any decimal after .49 rounded is the number above it, anything below .50 rounded is the same number. example: 2.38 rounded is 2, 2.87 rounded is 3
1.471 rounded to a whole number is 1
299,792,458 ms in Scientific Notation = 2.99792458 x 108 ms
85,500 is the lowest number that can be rounded to 86,000. 85,499 would round down to 85,000