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    E:\Working\Orange_Education\TouchPad_Maths_4\Open_Files\Chap_11\Chap_11
                     \ 10-Nov-2025  Bharat Arora   Proof-8                                    Reader’s Sign _______________________ Date __________

                                                                                                           HOTS
                                                                                                  21 st
                                                                                                 Century   #Computational Thinking
                                                                                                  Skills
                    The time taken by each team in two rounds of a swimming championship is given
                    below. Rank the teams from the fastest (1st) to the slowest (4th) based on the total time

                    taken in both rounds.

                           Team                   A                    b                    C                    d

                     Round-1               1 h 45 min 10 s      1 h 55 min 19 s     2 h 39 min 10 s      1 h 49 min 36 s

                     Round-2               2 h 14 min 53 s      2 h 15 min 10 s     2 h 55 min 19 s      2 h 10 min 26 s
                     Total Time

                     Rank

                                                      Fun                  Activity

                        Study the calendar and see the magic of operations.                   21 st
                                                                                             Century   #Experiential Learning
                            •  Choose any month from a calendar.                             Skills
                                                                        march
                                                           S    M    T    W     T    F     S

                                                                1    2     3    4    5     6
                                                           7    8    9    10    11   12   13
                                                          14    15   16   17    18   19   20
                                                          21    22   23   24    25   26   27
                                                          28    29   30   31

                            •   Choose any 3 × 3 grid (9 dates) in that month and draw a box around it.
                            •   Find the total of all the numbers in the box by using this short cut.

                               •   Add 8 to the smallest number in the box (i.e. 1 + 8 = 9 in the example).
                               •   Multiply the answer by 9 ( 9 × 9 = 81). The total of all the numbers in the box
                                  = 81.
                               •  Check your answer by actually adding all the numbers in the box.
                                                        1 + 2 + 3 + 8 + 9 + 10 + 15 + 16 + 17 = 81

                            •  Do the same with a few more boxes.

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