Mathematics
Addition & Subtraction
Procedural
6–7 yrs
Fluent addition and subtraction
加减法的流利运算
Description
Recall and use addition and subtraction facts to 20 fluently, and derive and use related facts up to 100
Mastery Evidence
- Rapidly recall 7 + 8 = 15 and 15 − 8 = 7
- Use 6 + 4 = 10 to derive 60 + 40 = 100
- Derive 35 + 5 = 40 from knowledge that 5 + 5 = 10
Assessment Prompt
Can your child quickly recall facts like '9 + 7 = 16' and '16 − 7 = 9', and use those to help work out bigger sums like '90 + 70'?
Prerequisites 2
Addition and subtraction within 20
流畅地记忆20以内的数学事实，建立在20以内策略性计算的基础上
The two digits of a two-digit number
推导100以内的数学事实有赖于对位值概念的理解
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