Rounding is making an approximation of a number so it is easier to work with.
eg 1
9 ≈ 10 (≈ means approximately equal to)
53 ≈ 50
These two examples were rounded to the nearest whole number of 10.
eg 2
165 ≈ 200
545 ≈ 500
989 ≈ 1000
1378 ≈ 1400
These four examples where rounded to the nearest whole number of 100.
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Since 25 is a whole number, the answer is 25.
To round to the nearest number.
The answer might depend on what you mean by "tn hundred".
Only if you were asked to find the mean to the nearest tenth. If so, don't round each number; calculate the mean first and then round it to the nearest tenth.
100