關於這本電子書
Addition and Subtraction Beginning Addition and Subtraction Facts • Add and subtract one digit numbers without regrouping • Understand that addition and subtraction are opposite/inverse operations Solving Addition and Subtraction • Solve addition and subtraction problems including word problems, involving two-and-three digit numbers with regrouping. • Complete an addition and subtraction sentence with missing addends including inverse relationships between addition and subtractions
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