If you don't know them, use a calculator, though on tests and such, doing in your head is much faster than using a calculator. However, I would recommend knowing up to 11 or 12, for speed and just general knowledge.
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It is always easy to do things if you dont know your time tables in year 2 your kid needs to re pet!
You gotta know your time tables.. Then after you know them then you can learn division.
Depending on the job, you might have to know all the tables! As a student gets further and further into mathematics, there are more tables to memorize in order to save some time on math problems.
If at school you have a computer/laptop/computer room on your desktop EVERY school should have primary volumes 1,2,3 etc! I know because I am in year 6 and I have answered this question by my laptop...and I have primary volumes 1,2,3 etc!! These are how I learnt my times tables!!
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