Question

the sum of my digits is 11 when rounded to the nearest hundred i am 500 rounding to the nearest ten makes me 530

Answer 1

533.
nearest hundred is 500 so it's less than 550.

nearest ten is 530, so it's between 525-535.

Since 5+2+5 > 11, it has to be 530+
That leaves 5+3+3=11. Simple!