Mathematics
Number Representation & Place Value
Procedural
9–10 yrs
Rounding Large Numbers
大数的四舍五入
Description
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
Mastery Evidence
- 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
Assessment Prompt
Can your child 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?
