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    E:\Working\Focus_Learning\Math_Genius_2_(09-10-2023)\Open_Files\Chap_03
                   \ 16-Feb-2024  Bharat Arora   Proof-6                                    Reader’s Sign _______________________ Date __________

                  5.     t    O                t   O                      6.      t   O                t    O

                         5    0                                                   5    6
                     –   3    0            +                                  –   3    8           +

                  RelATION BeTWeeN ADDITION AND SUBTRACTION

                  There is a special relationship between addition and subtraction facts. This
                  relationship can be seen in fact families. A fact family is a set of facts with the same

                  three numbers. Look at the collection of stars.
                  In the following fact family, all four facts have the numbers 6, 9 and 15.

                        t   O             t   O             t   O             t   O
                             6                 9            1    5            1    5
                    +        9        +        6        –        9        –        6

                        1    5            1    5                 6                 9

                  There are 18 caps, out of these 12 are green and 6 are red.

                  Let us write the fact family for 6, 12 and 18.

                       t   O             t   O             t   O             t   O
                                                                                                         Note
                       1    2                 6            1    8            1    8             The same three
                   +        6        +   1    2        –   1    2        –        6             numbers are used, but

                       1    8            1    8                 6            1    2             in different orders.

                           Practice Time 3e

                  Write the fact family for each group of numbers.

                    1.           5, 6, 11               2.         9, 12, 21              3.         17, 21, 38

                                +        =                          +       =                         +        =

                                +        =                          +       =                         +        =

                                –        =                          –       =                         –        =

                                –        =                          –       =                         –        =

                  Mathematics-2                                                                                          61

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