# Thread: 1.09 * 1.09 by hand

1. ## 1.09 * 1.09 by hand

Hi everyone,

I am trying to multiply 1.09 * 1.09 by hand and I am not getting it. Can anyone tell me what I am doing wrong in the calculation?

1.09
1.09
-----
981
0000
98100
-------
9.9081

?????

Obviously the answer is 1.1881 but I am doing something wrong with this problem?

2. Originally Posted by pc510
hi everyone,

i am trying to multiply 1.09 * 1.09 by hand and i am not getting it. Can anyone tell me what i am doing wrong in the calculation?

1.09
1.09
-----
981
0000
98100
-------
9.9081

?????

Obviously the answer is 1.1881 but i am doing something wrong with this problem?
xx1.09
xx1.09
----------
xx981
x0000
10900
-------
1.1881

3. Originally Posted by pc510
Obviously the answer is 1.1881 but I am doing something wrong with this problem?
In case the answers you have seen don't make it clear, your error was that you multiplied 1.09 * 9.09 rather than 1.09 * 1.09.

An important skill in math is to be able to look over your work and find such a "silly" error. This commonly means, first, writing clearly what you did, so that you can compare it with what you intended to do; and, second, reading what you did and comparing with what you intended (in this case, "I intended in the third row to multiply 1.09 by 1 -- but, look! I multiplied by 9 instead"),

4. Code:
1.09   x  1.09
--000
---981
======
1.1881

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