Difference between revisions of "Numbers - how to write them"

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The SI system uses a lot of prefixes for unit quantities, and we'll present a few of them here:
 
The SI system uses a lot of prefixes for unit quantities, and we'll present a few of them here:
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{|class="wikitable"
 
{|class="wikitable"
 
!style="text-align: center"| Name
 
!style="text-align: center"| Name
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!style="text-align: center"| Short scale name
 
!style="text-align: center"| Short scale name
 
|-
 
|-
| [[peta-|peta]]
+
| peta
 
| style="text-align:center;" |  P
 
| style="text-align:center;" |  P
 
| style="text-align:left;" |&nbsp;10<sup>15</sup>
 
| style="text-align:left;" |&nbsp;10<sup>15</sup>
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| style="text-align:center;" |&nbsp;quadrillion
 
| style="text-align:center;" |&nbsp;quadrillion
 
|-
 
|-
| [[tera-|tera]]
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| tera
 
| style="text-align:center;" |  T
 
| style="text-align:center;" |  T
 
| style="text-align:left;" |&nbsp;10<sup>12</sup>
 
| style="text-align:left;" |&nbsp;10<sup>12</sup>
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| style="text-align:center;" |&nbsp;trillion
 
| style="text-align:center;" |&nbsp;trillion
 
|-
 
|-
| [[giga-|giga]]
+
| giga
 
| style="text-align:center;" |  G
 
| style="text-align:center;" |  G
 
| style="text-align:left;" |&nbsp;10<sup>9</sup>
 
| style="text-align:left;" |&nbsp;10<sup>9</sup>
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| style="text-align:center;" |&nbsp;billion
 
| style="text-align:center;" |&nbsp;billion
 
|-
 
|-
| [[mega-|mega]]
+
| mega
 
| style="text-align:center;" |  M
 
| style="text-align:center;" |  M
 
| style="text-align:left;" |&nbsp;10<sup>6</sup>
 
| style="text-align:left;" |&nbsp;10<sup>6</sup>
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| style="text-align:center;"|&nbsp;million
 
| style="text-align:center;"|&nbsp;million
 
|-
 
|-
| [[kilo-|kilo]]
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| kilo
 
| style="text-align:center;" |  k
 
| style="text-align:center;" |  k
 
| style="text-align:left;" | 10<sup>3</sup>
 
| style="text-align:left;" | 10<sup>3</sup>
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| style="text-align:center;" |&nbsp;thousand
 
| style="text-align:center;" |&nbsp;thousand
 
|-
 
|-
| [[hecto-|hecto]]
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| hecto
 
| style="text-align:center;" |  h
 
| style="text-align:center;" |  h
 
| style="text-align:left;" |10<sup>2</sup>
 
| style="text-align:left;" |10<sup>2</sup>
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| style="text-align:center;" |&nbsp;hundred
 
| style="text-align:center;" |&nbsp;hundred
 
|-
 
|-
| [[deca-|deca]]
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| deca
 
| style="text-align:center;" |  da
 
| style="text-align:center;" |  da
 
| style="text-align:left;" |10<sup>1</sup>
 
| style="text-align:left;" |10<sup>1</sup>
 
| style="text-align:right; font-feature-settings: 'tnum';" |  10
 
| style="text-align:right; font-feature-settings: 'tnum';" |  10
 
| style="text-align:center;"|&nbsp;ten
 
| style="text-align:center;"|&nbsp;ten
|-}
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|}
  
==What can happen if you get numbers wrong?==
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==What can go wrong if you write numbers the wrong way?==
(SEK 3 181 million)
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Revision as of 13:23, 13 September 2019

Background

We get quite a lot of questions from students regarding various prefixes like mega, giga, etc. What do they stand for? What symbol should we use?

It's rather easy to make mistakes with the symbols for the prefixes (and I'm sure you can find tons of such mistakes here on the wiki). But if you really want to know, we'll list a few here (and this time we'll be careful to make it right).

The SI system uses a lot of prefixes for unit quantities, and we'll present a few of them here:

Name Symbol Base 10 As a number Short scale name
peta P  1015 1 000 000 000 000 000  quadrillion
tera T  1012 1 000 000 000 000  trillion
giga G  109 1 000 000 000  billion
mega M  106 1 000 000  million
kilo k 103 1 000  thousand
hecto h 102 100  hundred
deca da 101 10  ten

What can go wrong if you write numbers the wrong way?

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