质数
Prime numbers
认识并运用质数、质因数和合数的术语；能判断100以内的数是否为质数；能背出19以内的质数。
Know and use the vocabulary of prime numbers, prime factors, and composite numbers; establish whether a number up to 100 is prime; recall prime numbers up to 19
学习证据 / Evidence
- 解释质数恰好只有两个因数：1和它本身
- 判断51是质数还是合数，并说明理由
- 凭记忆列出19以内的所有质数
- Explain that a prime number has exactly two factors: 1 and itself
- Determine whether 51 is prime or composite and justify the answer
- List all prime numbers up to 19 from memory
评估问题 / Assessment
{{name}}能告诉你，一个数为什么是“质数”——它只能被1和它本身整除——并举出一些例子，比如7、11和13吗？
Can {{name}} tell you what makes a number 'prime' — that it only divides exactly by 1 and itself — and give some examples like 7, 11, and 13?