The number you are multiplying by is the amount of 'lots' of the number you are multiplying.
e.g. 5x4
is the same as 4 'lots' of 5
so it is 5+5+5+5
and the answer is 20.
e.g. 13x12
is the same as 12 'lots' of 13
so it is 13+13+13+13+13+13+13+13+13+13+13+13
and the answer is 156.
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3n means the three times tables and you can also say 3 position but 3n is the short way of saying the 3 times tables
It depends on what part of maths you are looking for. Mathletics is very useful for time, division, mulipication, confert from rowman nermalrels, etc Or Rainforest maths. If you are in a lower level. Or a times table game called time tables.
It is usually algebra whereas x is an unknown variable.
in maths it denotes as10