Tally marks can be defined in the unary numeral system. It is a form of numeral which is used for counting. The general form of writing tally marks is as a group or set of five lines. The first four lines are drawn vertical and each of the fifth line runs diagonally over the previous four vertical lines, i.e., from the top of the first line to the bottom of the fourth line. Tally mark is the quickest way of keeping track of a group of five.
Tally marks are the quickest way of keeping track of numbers in groups of five.
Tally mark graph is a graphical representation of the data. It is very helpful to read the data very quickly. Tally marks in graphs are a quick way of keeping track of numbers in groups of five. Graph table has one vertical line which is made for each of the first four numbers and the fifth number is represented by a diagonal line across the previous four. Let us see with the help of example how to create a graph for the data written in tally form.
Given below are some of the examples on tally marks.
Lets consider the marks of 25 students in standard IX in a particular school. The scores are as follows:
53, 64, 31, 53, 33, 70, 61, 74, 32, 53, 56, 56,
64, 56, 88, 28, 70, 56, 64, 74, 53, 53, 61, 31.
The maximum mark allotted to the paper is 100. Draw a tally chart for the above data. Solution:
Rearranged data in ascending order:
Using the tally mark table, different data can be obtained without actually going through the observations.
Consider a garden with lots of flowers. Mary has different types of flower pots which are given in the table below:
Using this table, it's very easy to get different information, without actually going through the observations.
1. How many Daisy flower pots are there?
2. Which two flowers have the same number of pots?
3. Which flower has the maximum number of pots? Solution:
1. It can be seen that there are two tally marks in front of the Daisy row. So the number of Daisy flowers pots is 2.
can be seen that in front of Lily and Jasmine, the number of tally
marks are 4. So both Lily and Jasmine has the same number of pots.
the table, the maximum number of tally marks 10, can be seen only in
the Tulip row. So, the Tulip has the maximum number of pots.
The following raw data shows the heights of 40 students of a class division.
156, 134, 152, 162, 148, 141, 147, 139, 147, 152,
144, 154, 133, 144, 153, 161, 149, 156, 137, 150,
146, 135, 142, 152, 148, 154, 138, 139, 157, 144,
147, 149, 139, 142, 155, 143, 131, 154, 146. Solution:
class limits should be fixed so as to include the least score 128 in the
first class and the highest score 162 in the last class. This can be
done as follows:
marks give a good basis for small children who have started to learn
about numbers. It gives them an idea of arranging and differentiating.