Answer:
15,208 Nearest Hundred: 15,200
20,643 Nearest Thousand: 21,000
Explanation:
1. 15,208. We are focusing on the nearest hundred, this means we are talking about the '208' part. Anything under 250 will be rounded down. Anything 250 and over is rounded up. We round this one down to 200.
2. 20,643. We focus on the thousands. 20,643 is rounded up because the '643' part at the end is over 500. If it was 20,450 for example we would round down since it's under 500.
Hope this helps