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    or "How many plants are there in your garden?" you simply count the objects and
     In which group does the number 40 not belong?
                     have your answer. However, when questions are asked to a group and the group
       a)  5, 10, 15, 20, ….     b)  8, 16, 24, 32, ….
                     gives different answers, it becomes quite difficult to count each data. This is where
       c)  6, 12, 18, 24, ….     d)  4, 8, 12, 16, ….  a survey comes in. A survey is when you ask many people the same question to get

                     their answers.
     Here are some more additional examples of sorting data:  For example, let’s say you ask your class, "What is your favourite sport?" Some

       By name: When sorting a list of people, you can group them alphabetically, from   answers could be:
     A to Z.
                       Football
       By height: If you have a group of people or objects, you can sort them by their     Cricket

     height, from shortest to tallest, tallest to shortest.
                       Basketball
       By category: You  can  sort  digital images  by  category, like  vacation  photos,

     project images or family pictures.  Each of these answers is data. To find out which sport is the most popular, you can
                     count how many times each answer is given. But it might be hard to keep track of
       By subjects: Books or files can be sorted based on subject.
                     all the answers, so we use tally marks to make counting easier.
       By date: You can sort events, documents or photos by the date they were created
     or occurred, from the earliest to the latest or vice versa.  Using Tally Marks to Count

     21 st           Tally marks are a system of counting used to keep track of                       fact bits
     Century   #Critical Thinking
     interdisciplinary activity  Skills  numbers in an organised way. A vertical line (|) represents   Tally marks, one of
                     one count and every fifth count is marked by a diagonal                      the earliest methods
     Write down a list of at least 10 city names in your notebook. Then, sort them according to a

     suitable characteristic, such as alphabetical order. Explain why you chose that particular way   line across the first four vertical lines, creating a bundle   of counting, have
     to sort the cities. Next, collect pictures of different plants and animals. Sort them into groups,   (I I I I), making counting faster and easier.  been used since the
     such as by where they live or by their size. Explain why you decided to sort them in that way.  For example,  in  a  class  of  72 students,  a  survey  was   Stone Age.
                     conducted  to  ask  their favourite  sport  between  cricket,

     21 st           football,  chess,  tennis  and  basketball.  Using  tally  marks,
     Century   #Technology Literacy
     ai in action  Skills  the data looked like this:

     The  PBS  Kids -  Sid  the Science Kid: Sorting Box game  is an interactive  and
     educational online game designed for younger children to help them understand the concept of   Favourite Sport  Tally Marks  Count
     sorting. It is ideal for building foundational cognitive skills, such as categorisation and classification,   Cricket  I I I I  I I I I  I I I I  I I I I  I I  22
     through fun and engaging gameplay.
     Visit the given link or scan the QR code to play the game:  Football  I I I I  I I I I  I I I I  14

     https://pbskids.org/games/play/sorting-box/487  Basketball  I I I I  I I I I                10
                               Tennis                    I I I I  I I I I  I I I I  I I I         18

     ASKING AND COUNTING       Chess                     I I I I  I I I                           8

     To collect data, questions need to be asked. Sometimes collecting data is simple.   As you can see from the tally, cricket is the most popular sport, followed by tennis,

     For example,  if you are  asked,  "How  many  pencils  are  there  in  your  box?"     football, basketball and then chess.

                                                                                                 Data Around Us       25

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