位值理解与数的基本关系

运用位值理解和数的基本关系来解决问题

Use place value understanding and number facts to solve problems

学习证据 / Evidence

• 利用34=30+4的知识来帮助计算34+20=54
• 解决“我想了一个数，加上10得到45。这个数是多少？”这类问题
• 在新的情境中运用数的拆分来解决问题

• Use knowledge that 34 = 30 + 4 to help add 34 + 20 = 54
• Solve 'I think of a number, add 10, and get 45. What was my number?'
• Apply partitioning to solve a problem in an unfamiliar context

评估问题 / Assessment

如果问{{name}}“47和54哪个更接近50？”，{{name}}能运用数的知识快速回答并解释原因吗？

If {{name}} is asked 'which number is closest to 50 — 47 or 54?', can they use their number knowledge to answer quickly and explain why?