It depends on how many sigdificant figures you are considering. If you are looking at 1 x 106 then 500,001 is the smallest whole number to round to one million, but really anything over 500,000 will round up. However if you are talking about 1,000,000., then anything over 999,999.5 will round up.
3,500,000 rounds up. 3,499,999 rounds down.
600
If the number is one, then it is the smallest positive square.
The smallest negative one digit number is -9, and the smallest positive one digit number is either 0 or 1, I'm not sure about the positive.
-9
There aren't any. If you are rounding to the nearest million, any number 500000 and above rounds to one million. 499999 and below round to zero.
3,500,000 rounds up. 3,499,999 rounds down.
3,500,000 rounds up. 3,499,999 rounds down.
3,500,000 rounds up. 3,499,999 rounds down.
1,000,000 (one million).
100,000,000 (one hundred million)
600
That rounds to one million.
One million is already a pretty round number. To the nearest 170, 1000000 rounds to 999940.
There is no biggest number that rounds to 110000. There is a smallest number that rounds higher. 110000.5, also represented by 110000.4999(infinitely repeating 9s) is the smallest number that rounds up to 110001. 110000.49 works, so does 110000.499, so does 110000.49999, so does 110000.4 followed by any FINITE string of 9s. But 110000.4 followed by an infinite string of 9s does not. The reason there is no biggest number that works is that if you were to pick ANY number that works, I could simply go one decimal position further. The numbers that round to 110000 form the half-open interval [109999.5,110000.5)
It is 2.85 that rounds to 2.9 to one decimal place
The smallest multiple of a number is itself.