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    E:\Working\Orange_Education\Math_Genius_2\Open_Files\Chap_03
                   \ 26-Sep-2025  Bharat Arora   Proof-10                                   Reader’s Sign _______________________ Date __________

                  CheCKING SUBTRACTION WITh ADDITION

                  Rinki joined the students committee and deposited `80. She withdrew `45 in the

                  same month. Hence, she was left with 80 – 45 = `35. Now she wants to check if
                  her subtraction was correct or not. So, she checks as follows:

                         t    O                                                  t   O
                         7   10                                                  1

                         8    0         Minuend                                  3    5       We get the minuend.
                     –   4    5         Subtrahend                           +   4    5       So, the answer is
                         3    5         Difference                               8    0       correct.

                  Let us look at a few more examples.
                  (a)                 Checking                              (b)                           Checking

                           t    O                t    O                              t    O                  t   O
                           4    7                2    1                              2   10                  1

                       –   2    6            +   2    6                              3    0                  1    8
                           2    1                4    7                          –   1    2              +   1    2
                                                                                     1    8                  3    0
                        The answer is correct.                              The answer is correct.

                  Thus, the sum of the ‘difference’ and the ‘subtrahend’ is the ‘minuend’.
                  That is:              Difference + Subtrahend = Minuend

                           Practice Time 3D
                  Find the difference and check the answer by addition.

                  1.     t    O                t   O                      2.      t   O                t    O

                         3    7                                                   2    9
                     –   1    2            +                                  –   1    9           +

                  3.                                                      4.
                         t    O                t   O                              t   O                t    O

                         5    0                                                   6    0

                     –   3    0            +                                  –   4    9           +

                   teacher’s   1.  Tell the students that addition and subtraction are opposites of each other. So, one can be used to check
                      tip          the other.
                               2.  Encourage the students to develop their subtraction strategies and check them.

                  60                                                                                    Mathematics-2

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