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    D:\Working\TouchPad_Maths\TouchPad_Maths_1\Open_Files\Chap_07\Chap_07
                   \ 17-Nov-2025     Surender Singh Rothan   Proof-7                           Reader’s Sign _______________________ Date __________

                              Exercise 7F

                  Subtract the tens vertically.

                     1.        T O       2.        T O        3.        T O       4.        T O        5.       T O

                               7 0                 5 0                  4 0                 7 0                 6 0

                          – 6 0                – 3 0               –    1 0             – 3 0               – 3 0

                     6.        T O       7.        T O        8.        T O       9.        T O      10.        T O

                               8 0                 8 0                  4 0                 3 0                 6 0

                          – 4 0                –   2 0             – 3 0                –   1 0             – 4 0

                  SuBtrACtinG 2-diGit nuMBErS

                  using Expanded Form

                  Example 1. Subtract 42 from 79.                             T O
                  Solution. Write the given numbers in                        7 9               7 tens and 9 ones

                  expanded form and then subtract.                        – 4 2               - 4 tens and 2 ones
                  Thus, 79 - 42 = 37.
                                                                              3 7              3 tens and 7 ones
                  using the Short Method

                  Example 2. Subtract 43 from 65.

                  Solution.
                  Step 1. Subtract the ones.                            Step 2. Subtract the tens.

                               T O                                                    T O
                               6 5                                                    6 5

                           – 4 3                                                 – 4 3

                                    2                                                 2 2

                  So, 65 - 43 = 22.

                                                                                                                  115
                                                                                Addition and Subtraction up to 100

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