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                 \ 10-Nov-2025  Bharat Arora   Proof-8                                     Reader’s Sign _______________________ Date __________

                                                                                                21 st
                          Activity                                                             Century   #Computational Thinking
                                                                                                Skills

                                                     Finding mystery Numbers
                   Perform this activity in pairs.

                   Each player thinks of a 5-digit number and creates an index card by writing clues for
                   finding the “Mystery Number".                                                mystery Number

                   For example:                                                                TTh  Th H      T   O

                   Clue 1: The digit in the tens place is 0.
                   Clue 2: The digit 5 has a place value of 50,000.

                   Clue 3: The digit in the hundreds place is the product of 3 and 2.
                   Clue 4: The second digit from the left is 7.

                   Clue 5: The sum of the digits of the number is 26.

                   Then they will exchange index cards and find the number. The player who writes the
                   “Mystery Number" first will get a point.

                   Repeat the activity for 3 or 5 rounds. The player with more points will be declared the winner.

                rOuNDINg NumberS

                Read out the following interesting facts.

                   Lightning strikes the       A hummingbird’s          The Eiffel Tower has        We take about
                   Earth about 6,000          heart beats about          about 1,700 steps.        23,000 breaths
                   times every minute.         1,000 times in a                                       every day.
                                                    minute.

                The facts  mentioned  above  do  not  give  exact  numbers  (figures).  They  give  only
                approximate  values. The actual  figures could  be  slightly  higher or lower than the
                numbers mentioned above. Such numbers are called rounded numbers.

                        18       Mathematics 4

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