Tally numeration system
The tally numeration system is probably the simplest of all numeration systems ever used.
It makes use of single strokes to represent object being counted. One stroke is used for each object
The following shows how we can use stroke(s) to represent the count for 1, 2, or 3 squares
Although one advantage is simplicity, there are two disadvantages.
First, large number will require an aweful lots of strokes.
Second, it will be somewhat difficult to real such large number
For example, can you tell what number is represented by the tally marks below?
I know what you are doing right now. You are using your finger to count the strokes
However, would you be able to do that without confusing yourself or losing your place if there were 50 strokes?
If you did not lose your place, you must have counted 20 strokes
However, the introduction of grouping made it a lot easier to read numbers
In this case, we place a fifth tally mark across every four to make a group of 5
The number shown above will be represented as follow:
Did you notice that you were able to find the number a lot faster?
Basically, that is all there is to this numeration system.Today, this numeration system is used a lot in statistics.
Oct 15, 18 11:05 AM
why the rule of 72 works- math explanation of where the 72 came from.
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