Brainteen
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- 6–9 岁
- 数学
- 学习单
课程标准关联
- Common Core 1.OA.D.8: Find the unknown whole number in an addition or subtraction equation, such as 8 + ? = 11.
- Common Core 2.OA.B.2: Add and subtract fluently within 20 using mental strategies, and know all sums of two one-digit numbers from memory.
- England NC Y2.MA.ASN.5: Use the inverse relationship between addition and subtraction to check calculations and solve missing number problems.
- Programmes FR C2.MA.NC.3: Mental calculation: know and use addition and subtraction facts.
许可协议：Crayonbird original
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