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Subtracting 999-100

```
Date: Tue, 6 Dec 94 14:55:39 PST
From: michael laue
Subject: math

Dear Dr. Math,

My name is Michael Laue.  I want to ask you a question -- it is
what is the answer to this:  999-100?
```

```
Date: Wed, 7 Dec 1994 00:06:55 -0500 (EST)
From: Dr. Sydney
Subject: Re: math

Dear Michael,

Hello there!  Thanks for writing Dr. Math!  To subtract numbers I find it
easiest to write them on top of one another so that the right hand sides
line up, like this:

999
-100
------

Then you subtract as you would with simpler numbers, starting with the
right side. 9 - 0 is 9, and 9 - 1 is 8, so you get:

999
-100
----
899

answer and the number being subtracted -- you should get the number
from which you are subtracting.  So check:  is 899 + 100 = 999?

I hope this helps.  Write back if you have any other problems.

Sydney
```
Associated Topics:
Elementary Subtraction

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