In this problem, we have a 1,000-digit number.
在这个问题中，有一个1,000-位的数字。
The batch number is an 11 digit number located on the bottom of each unit.
批号是11位数的，位于每台装置的底部。
No matter what your 2-digit number is, the result is always a multiple of 9.
无论你所选的数字是甚么，其答案永远都是9的倍数。
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。
There, on the whiteboard, was a ten-digit number written in a small, neat hand.
在那里，就在那块白板上，写着一行十位数字，字迹小巧工整。
There, on the whiteboard, was a ten-digit number written in a small, neat hand.
在那里，就在那块白板上，写着一行十位数字，字迹小巧工整。
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