Rounded numbers can be easier to use and remember than exact numbers. When you round a number to the nearest 10,000, you are determining what multiple of 10,000 the number is closest to. For instance, the number 24,000 is closer to 20,000 than 30,000, so it rounds down to 20,000.
Find the number that is in the ten-thousands place. For instance, in the number 64,700, the number 6 is in the ten-thousands place.
Look at the number immediately to the right of the number in the ten-thousands place. In the number 64,700, you would look at the number 4.
Increase the number in the ten-thousands place by one if the number to the right of it is five or greater. Then change all numbers to the right of the ten-thousands place to zeros. For example, the number 87,500 would round up to 90,000.
Keep the number in the ten-thousands place the same if the number to the right is less than five, and change all of the numbers that follow to zeros. For example, the number 84,500 would round down to 80,000.