Question

a) Ravi recorded the blood group of 25 of his classmates. The blood group of 16 of them
was 0+. We can represent this number using tally marks as​

Answer 1

Given :  Ravi recorded the blood group of 25 of his classmates.

The blood group of 16 of them was O+

To Find : represent this number using tally marks

Solution:

Tally marks are a unary numeral system.

These are also called hash marks,

These are in  form of numeral used for counting.

a line is use to represent 1

two line for 2

three lines for 3

4 lines for 4

1  - |

2 - ||

3 - |||

4 - ||||

Making reading easier 5 is represented by crossing 4 lines

5 - $\setlength{\unitlength}{0.5cm} \begin{picture}(4,4) \multiput(2, 1)(0.2, 0){4}{\line(0, 1){0.5}} \put(1.8, 1){\line(2, 1){1}} \end{picture}$

Then again same process followed

16  = 5 + 5 + 5 + 1

Hence 16 can be represented as

$\setlength{\unitlength}{0.5cm} \begin{picture}(4,4) \multiput(2, 1)(0.2, 0){4}{\line(0, 1){0.5}} \put(1.8, 1){\line(2, 1){1}} \end{picture}$ $\setlength{\unitlength}{0.5cm} \begin{picture}(4,4) \multiput(2, 1)(0.2, 0){4}{\line(0, 1){0.5}} \put(1.8, 1){\line(2, 1){1}} \end{picture}$ $\setlength{\unitlength}{0.5cm} \begin{picture}(4,4) \multiput(2, 1)(0.2, 0){4}{\line(0, 1){0.5}} \put(1.8, 1){\line(2, 1){1}} \end{picture}$ |

Tally Marks is :

$\setlength{\unitlength}{0.5cm} \begin{picture}(4,4) \multiput(2, 1)(0.2, 0){4}{\line(0, 1){0.5}} \put(1.8, 1){\line(2, 1){1}} \end{picture}$ $\setlength{\unitlength}{0.5cm} \begin{picture}(4,4) \multiput(2, 1)(0.2, 0){4}{\line(0, 1){0.5}} \put(1.8, 1){\line(2, 1){1}} \end{picture}$ $\setlength{\unitlength}{0.5cm} \begin{picture}(4,4) \multiput(2, 1)(0.2, 0){4}{\line(0, 1){0.5}} \put(1.8, 1){\line(2, 1){1}} \end{picture}$ |

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