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    E:\Working\Orange_Education\Math_Genius_2\Open_Files\Chap_04
                   \ 26-Sep-2025  Bharat Arora   Proof-10                                   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          Step 2.  Next, subtract           Step 3.  Then, subtract the

                              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                       Knowledge Desk

                  now.                                                                A digital payment is a way of

                  Let us look at some more examples.                                  transferring money
                                                                                      from one payment
                  Example 1: Subtract the following.                                  account to another          Cross-Curricular Learning
                                                                                      using a digital device
                                  (a) 324 – 112                                       like a smartphone.

                                  (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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