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1 vote
4 answers
251 views

How to round numbers?

I have often thought that $3=3.0$ so one can round $3.4\approx 3.0$. But some math teachers says this is wrong. Which one is the correct answer? Why this might be wrong?
11 votes
4 answers
1k views

How to teach a weak student?

I am tutoring a 9th grade student. And he is terribly weak in mathematics. He doesn't remember the multiplication tables, can't divide efficiently. Doesn't know how to proceed with solving a ...
8 votes
2 answers
5k views

How to explain 1000 - 1 using the american method

I have developed a small Android app. The app is a pocket calculator for addition and subtraction, in which the calculation is explained via both video and audio. If it is unclear please have a quick ...