Rounding numbers to the nearest 1000

Maths

My number is 3740. Which of the following are the nearest two multiples of 1000?

My number is 8500. Which of the following are the nearest two multiples of 1000?

My answer is 1000, my number has been rounded to the nearest 1000. Which of the following numbers could my number have been?

My number is 3142. Which of the following are the nearest two multiples of 100?

My number is 4964. Which of the following are the nearest two multiples of 100?

My number is 2600, it has been rounded to the nearest 100. Which of the following numbers could my number have been?