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    E:\Working\Orange_Education\TouchPad_Maths_4_(10-11-2025)\Open_Files\Chap_02\Chap_02
                     \ 12-Nov-2025  Bharat Arora   Proof-8                                    Reader’s Sign _______________________ Date __________

                                                                                                           HOTS
                                                                                                        21 st
                                                                                                      Century   #Critical Thinking
                        1.  Find the missing digits.                                                   Skills

                           a.                                                b.
                                    2    3         4   5                              7    3        4    5
                                +   5         4        3                          +   1         9   6
                                         0    0    6                                  9    2    6        9

                           c.       7         0    4                         d.            7    3        4

                                –        9    7        8                          –   1    3        2

                                    5    0        0    5                              4    3    9   3    6

                       2.  Using all four of these number cards, form:                                 7     9     4     0

                           a.  the greatest 4-digit number _____________
                           b.  the smallest 4-digit number _____________

                           Now, find the difference of the two numbers formed.

                          Puzzle                                                                      Century   #Critical Learning
                                                                                                       21 st
                                                                                                       Skills
                        1.  There are nine numbers 1-9 to be put on the three discs.

                           a.   Abhay puts  three numbers on each number disc as shown                 1  2    4  5    7  8
                               here. Remove one number from one of the discs and place it               3       6        9
                               on another disc so that each of the three discs may have the same total.
                           b.    Arti wants to arrange the numbers such that each of the

                               discs must have three numbers and the same total. Can
                               you help her?
                                                                                         +   1    =        –   22    =
                       2.  Start with an operation, then use its result to solve
                           the next one, and continue until the entire puzzle       –        +         –        +        –

                           is completed.                                                –    3    =    1   +         =   5

                                                                                    =        =         =        =         =

                                                                                   49    +        =        –   26    =

                                                                                    +        +         –        –         +

                                                                                    4    +        =   13   –         =   0

                                                                                    =        =         =        =         =

                                                                                        –    13   =        –         =

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                                                                                        Addition and Subtraction

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