1
since first number after decimal is less than 5, round down to 1
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It is not given. If the number 115 was rounded to the nearest integer, there would be no way of determining the digit in the tenths place. If the number was written as 115.0 then the answer would be 0.
No. A whole number has no decimal part (or nothing but zeros after any decimal point present). As a recurring decimal 0.345345.... = 115/333
To the nearest ten, 120 To the nearest hundred, 100
Yes, it's just like 115 to the nearest hundred is 100. If the last two digits is less than 50 you have to round down. -15 to the nearest hundred is also 0. -95 to the nearest hundred is -100. -115 to the nearest hundred is -100. I'm not sure what -50 to the nearest hundred is, though!
100 lol