谁能帮我翻译一下这篇英语文章,最好能看得懂,拜托啦!

题目

谁能帮我翻译一下这篇英语文章,最好能看得懂,拜托啦!
Anybody can learn to count fast if he knows the secret of following trick.
Ask your friend to write any five-figure(五位) number on the blackboard. Then you write your five-figure number under it. You choose your figures so that each one with the figure above it will make nine.
Tell your friend to put a third five-figure number under your number. Then you write a fourth number in the same way. After he has written the fifth number, you draw a line under it and quickly write the sum(总和). You may even write it from left to right.
How do you do it? You take away two from the fifth number and put 2 in front of your answer. Is it interesting?

答案

任何人都可以快速的计算出结果,如果他知道了运算的规律.
让你的朋友在黑板上写下任意一个五位数,然后你在下面也写下一个五位数,要求这个五位数每个数字对应的上面的数字相加等于9.
让你朋友在你写的五位数下写第三个五位数,然后你以相同的方法写下第四个五位数.他写完第五个数字后,你画一条横线在下面,然后快速计算然后写下总数,你甚至可以从左到右写出答案.
你怎么做到的呢?你从第五个五位数中拿走两个数字,然后在你的答案前面加个2,有趣吗?
个人翻译,不懂的地方可以问我^-^