Well, we use commas every three digits to split up the number and make it easier.

我们通常每三位数一分位，这样就可以把大数字简化。

The number 57 306 contains five digits.

数字57 306是个五位数。

Many people inadvertently transpose digits of the ZIP code.

许多人粗心地把邮政编码的数字弄颠倒了。

Using a Magic Marker, he wrote seven digits on the poster-size banner.

他用白板笔在海报大小的横幅上写了七个数字。

What's the biggest number you can represent with three decimal digits?

你能用三个十进制数字表示的最大数字是多少？

Perhaps in the broader world, you might find years that have two or four digits and might even contain an apostrophe, as in '09.

可能在一个更广阔的世界，您可能发现拥有两位或四位数字的年份，甚至可能包含一个撇号，如'09。