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    E:\Working\Focus_Learning\Math_Genius_1_(05-10-2023)\Open_Files\08_Chap_7\Chap_7
                   \ 11-Sep-2024  Bharat arora   Proof-6                                    Reader’s Sign _______________________ Date __________

                           Practice time 7A

                  Add the following.

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

                            1     5                  4     1                 2     5                   5      8

                       +          4              +         6            +          3               +          0

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

                            7     4                  8     1                 3     4                   6      2

                       +          4              +         7            +          5               +          7

                  Addition in tens

                  Example 1: Add 20 and 30.

                  Solution: We first take 2 tens and 3 tens. Then count and find 5 tens in all.

                                                                                                              tens Ones

                                                                                                                2      0
                                    +                           =                                           +   3      0

                                                                                                                5      0

                       2 tens       +          3 tens          =                  5 tens

                  Thus, 20 + 30 = 50.

                  Example 2: Add 30 and 10.

                  Solution: We already have 3 tens. If we get 1 ten more, we will have 4 tens in all.

                                                                                                              tens Ones

                                                                                                                3      0
                                           +                    =                                           +   1      0

                                                                                                                4      0

                          3 tens           +       1 ten       =                  4 tens

                  Thus, 30 + 10 = 40.

                  Mathematics-1                                                                                         105

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