Answers

2014-07-18T19:03:42+08:00
Techniques in adding numbers mentally are:
1) You must memorize multiplication table of many numbers for shortcuts
2) You better imagine that your solving somewhere.
3) Remember the numbers in your answer.

Can just tell you techniques because we can't really tell you how just techniques, sure that teachers can't tell you how too.
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2014-07-18T20:38:45+08:00