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    E:\Working\Focus_Learning\Math_Genius_2_(09-10-2023)\Open_Files\Chap_04
                   \ 17-Nov-2023  Bharat Arora   Proof-6                                    Reader’s Sign _______________________ Date __________

                  Let us arrange the numbers in columns of ones, tens and hundreds. Then subtract

                  starting from the ones place.

                   Step 1.   First, subtract the  Step 2.  Next, subtract  Step 3.  Then, subtract the

                              ones.                              the tens.                      hundreds.
                              5 – 2 = 3 ones                     4 – 2 = 2 tens                 8 – 6 = 2 hundreds

                                  H     t   O                        H    t    O                    H     t   O

                                   8    4    5                       8    4    5                    8    4    5
                               –   6    2    2                   –   6    2    2                 –  6    2    2

                                             3                            2    3                     2    2    3

                  Thus, 845 – 622 = 223.

                  That is, `223 is left in Amrita’s mobile wallet

                  now.                                                                Knowledge Desk
                                                                                     A digital payment is a way of
                  Let us study some more examples.                                   transferring money from
                                                                                     one payment account to
                  example 1: Subtract the following.                                 another using a digital
                                                                                     device like a smart phone.
                                  (a) 324 – 112

                                  (b) 750 – 300

                  Solution:  (a)           H     t   O                (b)        H    t   O

                                            3    2    4                          7    5    0
                                        –   1    1    2                      –   3    0    0
                                            2    1    2                          4    5    0

                                       Thus, 324 – 112 = 212                Thus, 750 – 300 = 450

                  example 2: Subtract 472 – 22 by writing in columns.

                  Solution:  We write the smaller number below the greater number and subtract

                                  starting from the ones place.

                                              H     t   O                                     Get it right!

                                               4    7    2                                Subtract 4 from 578.
                                           –        2    2                                 H T O             H T O
                                                                                           5 7 8
                                                                                                             5 7 8
                                               4    5    0                               –  4              –        4
                                  Thus, 472 – 22 = 450.                                    1 7 8      7      5 7 4     3

                  Mathematics-2                                                                                          77

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