How to do round to the nearest ten and hundred 762

Since, when we round a number to nearest ten, we see the digit on ones place,

If the ones place digit < 5

Then we rounded to preceding ten,

If the ones place digit ≥ 10,

Then we rounded to succeeding ten,

In the case of rounding to nearest hundred we see the tens digit,

If it is less than 5 then the number rounded to preceding hundred while if it is more than or equal to 5 then it is rounded to succeeding hundred,

Here, the given number,

762,

∵ 2 < 5 and 6 > 5

So, 762 ≈ 760 (nearest ten )

762 ≈ 800 ( nearest thousand )

i think is g(1)=-1.

hope that i can