Associated Topics || Dr. Math Home || Search Dr. Math

### Multiplying by a Decimal

```
Date: Thu, 10 Nov 1994 19:37:12 CST
From: Anonymous

Dr. Math,

I am in the 4th grade and I would like to know the answer to this
question. How come when you multipy 0.36 and 88 you get 9.4270,
which is less than what it should be?

I like math very much and I am glad you can help me when I have
questions.

Thanks, Richard
```

```
Date: Thu, 10 Nov 1994 20:54:28 -0500 (EST)
From: Dr. Ken

Well Richard,

I am very impressed that you noticed that 9.427 is smaller than
the answer should be.  You are right.  That is too small.  The reason
it seems too small is because it is not the right answer.

I would encourage you to try again to see if you can get an
answer that makes more sense to you.  If you still can't get it write
back and we will give you some more help.

-Ken "Dr." Math
```

```
Date: Thu, 10 Nov 1994 20:25:05 CST
From: Anonymous

Dear Dr.Math,

I am  Richard Griffin's brother, William Griffin. I am in 6th grade. I
when you multiply something like 0.5 and 4 it is less than four because
it is sort of like taking 0 and 4, but instead of taking it all the way to
0 it takes a percentage of it like 50% and so it makes the answer 50% less than
4, which is 2. Please correct me if I am wrong because my dad isn't the best
teacher.

William Griffin
```

```
Date: Thu, 10 Nov 1994 22:58:07 -0500
From: Anonymous

When you multiply something by 1 what do you get?

3 * 1 = ?

26 * 1 = ?

You just get whatever you started with, right?

And if you multiply by a number greater than 1, then you get an answer
bigger than you started with, right?

3*2=?

26*2=?

So if you multiply by something less than one you will get an answer
smaller than what you started with.

If you multiply by one half then you get half of what you started with.
There are lots of ways to write one half.

1/2 or .5 are two ways.

.5 * 8 = 4

.75 * 8 = 6

Write back if this is not yet helpful enough.

-- Steve
```
Associated Topics:
Elementary Fractions

Search the Dr. Math Library:

 Find items containing (put spaces between keywords):   Click only once for faster results: [ Choose "whole words" when searching for a word like age.] all keywords, in any order at least one, that exact phrase parts of words whole words

Submit your own question to Dr. Math
Math Forum Home || Math Library || Quick Reference || Math Forum Search