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    D:\Working\TouchPad_Maths\TouchPad_Maths_1\Open_Files\Chap_04\Chap_04
                   \ 17-Nov-2025     Surender Singh Rothan   Proof-7                           Reader’s Sign _______________________ Date __________

                    SubtrACting A 1-digit number from A 2-digit number

                    Let us subtract 7 from 18.
                    Step 1.  Write the bigger number on top  Step 2.    Subtract the tens.

                                and the smaller number below.                                     T O

                    Subtract the ones.
                                                                                                   1   8
                                      T O                                                     –        7

                                      1    8                                                       1   1
                                  –        7

                                           1                                    There are no tens in the second
                                                                                number to subtract.
                                8 ones – 7 ones = 1 one                         So, write 1 in the tens place.

                    Write 1 in the ones place.                                              Thus, 18 – 7 = 11.

                    Let us see some more examples.
                         a.        T O                 b.        T O                    c.        T O

                                   1   4                         1   7                            1    6

                              –        2                    –        5                        –        6

                                   1   2                         1   2                            1 0

                                Exercise 4F

                    Subtract the following.
                      1.         T O                        2.        T O                   3.        T O

                                  1   2                               1 9                              1   8

                             –        2                          –        3                       –        4

                      4.         T O                        5.        T O                   6.        T O

                                  1   5                               1   7                            1   1

                             –        3                           –       5                       –        1

                                                                                                                  61
                                                                                           Subtraction up to 20

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