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Mar5-14, 06:54 AM
Parenthesis use, for arithmetics between more than 2 numbers SHOULD be taught, and children will take it easily.
I have myself taught one child with a diagnosis of slight mental retardation,in half an hour how parentheses are just "math grammar/syntax", that tells what we should do first.
The child found it fun to see how 5-(3-2)=4, whereas (5-3)-2=0.
That is, understanding how parantheses matter.
The major fallacy in today's school teaching is to introduce parentheses at a LATE stage, i.e, when the kids are to be taught how to REMOVE them in order to get a logically equivalent expression i.e, how to rewrite 5-(3-2)=5-3+2, rather than train kids FIRST in calculating 5-(3-2)=5-1=4, and similarly (5-3)-2=2-2=0
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