It is clear that you can, by multiplying by n.
很显然你是可以的，乘以n就可以了。
Anything multiplying by "0" can be simplified down to zero.
任何乘以“0”的运算数都可以被简化成零。
The most obvious way to solve this problem is by "multiplying out".
最明显的办法来解决这个问题是“由”乘了。
This trick is a general solution for multiplying any single-digit number by 9.
这个技巧是应对任何个位数字乘以9的算式。
This trick is a general solution for multiplying any single-digit number by 9.
这个技巧是应对任何个位数字乘以9的算式。
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