大数的四舍五入
Rounding Large Numbers
利用位值理解，将任意不超过1,000,000的整数四舍五入到最接近的10、100、1,000、10,000或100,000。
Round any whole number up to 1,000,000 to the nearest 10, 100, 1,000, 10,000, or 100,000 using place-value understanding
学习证据 / Evidence
- 把456,782四舍五入到最接近的10,000（460,000）。
- 把950,500四舍五入到最接近的100,000，并解释这个边界情况。
- 用四舍五入估算387,412 + 214,560的和。
- Round 456,782 to the nearest 10,000 (460,000)
- Round 950,500 to the nearest 100,000 and explain the boundary case
- Use rounding to estimate the sum of 387,412 + 214,560
评估问题 / Assessment
{{name}}能否判断四舍五入时该看哪一位，例如把346,712四舍五入到最接近的1,000是347,000，到最接近的10,000是350,000？
Can {{name}} round a large number like 346,712 to the nearest 1,000 (347,000) or 10,000 (350,000) — identifying which digit to look at for each rounding?