Rounding numbers to the nearest 100

Maths

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?

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?