Limitations to Teaching Children 2+2=4: Typical Arithmetic Problems Can Hinder Learning Of Mathematical Equivlence
Reversing Education Majors' Arithmetic Misconceptions With Short-Term Instruction Using Manipulatives
Enhancing Arithmetic and Word Problem Solving...
Addition and subtraction by students with Down syndrome
Those are *very* credible, academic sources! I didn't look at them too closely, but I wonder if they aren't a little hard to understand though? I'll look around to see if I can find at least a few sources that are a little easier to understand--I'll send via email.
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