正着数和倒着数(9岁以上)
Counting forwards and backwards (age 9+)
以10的幂(10、100、1000、10000、100000)为步长,从任意一个不超过1,000,000的数开始向前数或向后数。
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
学习证据 / Evidence
- 从462,000开始,以10,000为步长往前数。
- 从800,000开始,以100,000为步长往后数。
- 根据序列375,000;475,000;575,000;……,写出接下来的三项。
- 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; ...
评估问题 / Assessment
{{name}}能否从任意一个数开始,以1,000或10,000为步长往前数或往后数——比如34,500、44,500、54,500——而不会数乱?
Can {{name}} 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?