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    D:\Working\TouchPad_Maths\TouchPad_Maths_1\Open_Files\Chap_03\Chap_03
                   \ 17-Nov-2025     Surender Singh Rothan   Proof-7                           Reader’s Sign _______________________ Date __________

                Adding 2-digit And 1-digit numberS

                Let us add 12 and 5.

                12 is a 2-digit number and 5 is a 1-digit number.

                To add numbers 12 and 5, we follow these steps.

                Step 1.    Write  the numbers one                      Step 2.   Add the tens.

                            below the other.                                            T O
                First, add the ones.                                                     1   2

                                  T O                                               +        5

                                  1   2                                                  1   7

                              +       5

                                      7                                There is no tens digit in the second
                                                                       number.
                2 ones + 5 ones = 7 ones                               So, write 1 in the tens place.
                Write 7 in the ones place.
                                                                       Thus, 12 + 5 = 17.

                Let us see some more examples.

                                      Tens                                              Tens

                  a.          T O              Ones                   b.        T O             Ones

                                   4                                            1    3
                          +    1   2                                        +        6

                               1   6                                            1    9

                            Exercise 3H

                  1.  Add the following:

                        a.         T O          b.         T O          c.         T O          d.         T O

                                       4                   1   2                       6                        3

                              +    1 0                +        6               +   1    1              +    1   4

                       46        Mathematics 1

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