Nine-thousand five-hundred and forty-two people attend a pop concert. Round this number to the nearest hundred.

Answer: nine-thousand five-hundred (9,500)
There are 9 thousands, 5 hundreds, four tens and 2 units. We need to round the hundreds and the answer we have in 5 hundreds. Because of there being 5 hundreds we need to look at the tens column as to whether we need to round up or down. There are 4 tens, this tells us that we need to round down because any numbers 5< we round up but any <5 we round down. The answer is therefore 9,500.