Mathematics
Number Representation & Place Value
Procedural
9–10 yrs
Counting forwards and backwards (age 9+)
向前数与向后数（9岁以上）
Description
Count forwards and backwards in steps of powers of 10 (10, 100, 1000, 10,000, 100,000) for any given number up to 1,000,000
Mastery Evidence
- Count on in 10,000s from 462,000
- Count back in 100,000s from 800,000
- Identify the next three terms: 375,000; 475,000; 575,000; ...
Assessment Prompt
Can your child count forwards and backwards in steps of 1,000 or 10,000 from any starting number — like 34,500, 44,500, 54,500 — without losing track?
Prerequisites 2
1000 More or Less
求比某数多/少1000是按10的幂次计数的先修知识
Place Value × 10 Pattern
理解×10的关系有助于掌握按10的幂次计数
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No follow-up topics
