The convention is that 5 rounds up . So therefore 10.49999999999..., and 10.5
A parabola opening up has a minimum, while a parabola opening down has a maximum.
749 is the greatest number that rounds down to 700.
949, which rounds down to 900.
3,500,000 rounds up. 3,499,999 rounds down.
3,500,000 rounds up. 3,499,999 rounds down.
That rounds down to 4.
3,500,000 rounds up. 3,499,999 rounds down.
18 The .333 rounds down
6.402 rounds down to 6. 6.5 rounds up to 7.
Vertex
149,889 rounds down to 100,000 152,909 rounds up to 200,000 (in both cases, rounding to the nearest 100,000)
There are multiple methods of rounding but the most common by far is to round up to the next whole number at .5 and higher (1/2 or more) and round down below .5 (less than 1/2). Ex: 10.1 rounds down to 10 10.49 rounds down to 10 10.5 rounds up to 11 10.99 rounds up to 11 10-1/2 rounds up to 11 10-29/60 rounds down to 10