Rounding numbers to the nearest 10

Maths

My number is 3641. Which of the following are the nearest two multiples of 10?

My number is 4304. Which of the following are the nearest two multiples of 10?

My number is 3780, it has been rounded to the nearest 10. Which of the following numbers could my number have been?

Mrs Crane has completed the following number line,  is she correct?

Complete this function machine by deciding if you need to subtract 10, 100 or 1000

I think of a number. I subtract 100, then subtract 1000. My answer is 3450. What was my number?