心算加减法（6岁以上）
Mental addition and subtraction (age 6+)
会用实物、图示或心算方法完成两位数加、减一位数的运算。
Add and subtract a two-digit number and ones mentally and using concrete/pictorial representations
学习证据 / Evidence
- 用实物或心算计算出 36 + 7 = 43
- 用数轴或心算计算出 52 − 4 = 48
- 解释在两位数加一位数时怎样通过凑十法来计算
- Calculate 36 + 7 = 43 using objects or mentally
- Calculate 52 − 4 = 48 using a number line or mentally
- Explain bridging through 10 when adding ones to a two-digit number
评估问题 / Assessment
{{name}}能心算“36 + 7”或“42 − 5”吗——保持十位不变，只调整个位？
Can {{name}} work out '36 + 7' or '42 − 5' in their head — keeping the tens in place and only adjusting the ones?