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    E:\Working\Focus_Learning\Math_Genius_1_(05-10-2023)\Open_Files\04_Chap_4\Chap_4
                   \ 11-Sep-2024  Bharat Arora   Proof-6                                    Reader’s Sign _______________________ Date __________

                  Subtracting a 1-digit number from a 2-digit number

                  Arshi collected 18 shells. 7 of them broke. How many shells are left with her?

                  To know the number of shells left, let us subtract 7 from 18.

                   Step 1.   Write the bigger number above  Step 2.  Subtract the tens next.

                              and the smaller number below.                         tens Ones
                                                                                      1      8
                              Subtract the ones first.                            –          7
                                                                                      1      1

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

                              8 ones – 7 ones = 1 one                             Hence, 18 – 7 = 11.

                              Write 1 in the ones place.                          Thus, 11 shells are left with Arshi.

                  Some more examples.

                       (a)                              (b)                              (b)
                             tens Ones                        tens Ones                         tens Ones
                               1      3                         1      8                          1     6
                           –          2                      –         5                      –         6
                               1      1                         1      3                          1     0

                           Practice time 4F

                  Subtract the following.

                  1.     tens Ones               2.   tens Ones           3.   tens Ones          4.    tens Ones

                           1      2                      1     9                 1      4                 1      5
                       –          2                 –          7             –          3             –          4

                  5.     tens Ones               6.   tens Ones           7.   tens Ones          8.    tens Ones

                           1      7                      1     1                 1      6                 1      8
                       –          5                 –          1             –          2             –          6

                  Mathematics-1                                                                                          63

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