What are all the whole numbers that become 310 when rounded to the nearest 10

Whole number is without decimals. 10.38 is closer to 10 than to 11. 4.71 is closer to 5 than to 4. So:
10 + 5 = 15

TenTH = A fraction of a whole, the 'th' tells that.
So, since 25,099 is a 'Whole' number, with No fraction of a whole, or no part/fraction of 1, therefor, rounded to the nearest tenth, it remains the same.

5.375 rounded to the nearest whole number is five (5).

7 (seven).

0.3203 rounded to the nearest whole number is zero (0).

Rounded to what?
To the nearest hundredth: 10.25
To the nearest tenth: 10.2
To the nearest whole number: 10
To the nearest ten: 10

Not sure if this is your question, but, the way we usually round down from 5 and round up from 6. Example: 1.586 rounded to the nearest 100th would be 1.59 , rounded to the nearest 10th would be 1.6... get it?

So, in your example, it would be : 40.98 = nearest 100th , 41.00 = nearest 10th , seeing as the .9 rounded up to a whole number, thus 1 !!

Hope this helps !!

Use the Math.Round() function. It takes two arguments, the first is your number or a variable holding your number and the second is the number of decimal places. This will only round to fractions of a whole number though and you need to round to the nearest 10. So divide your number by 10 before you round to shift the decimal place once to the left and multiply by 10 again afterwards to shift it back again.

answer = Math.Round(32.1 / 10, 0) * 10

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