Basic HTML Version

|  | Table of Contents |  | View Full Version

Page 30 - Touchpad Mathematics_Ver1.0_C4
P. 30

    E:\Working\Orange_Education\TouchPad_Maths_4\Open_Files\Chap_02\Chap_02
                 \ 10-Nov-2025  Bharat Arora   Proof-8                                     Reader’s Sign _______________________ Date __________

                 Step 4. Add the thousands and regroup.                Step 5. Add the ten thousands.

                                    TTh  Th  H T O                                      TTh  Th  H T O
                                     1   1   1  1                                         1  1   1   1
                                     3   6  9 7 6                                        3   6  9 7 6

                                  + 5    7  8 9 8                                     + 5    7   8 9 8
                                         4  8 7 4                                        9   4   8 7 4

                Therefore, 36976 + 57898 = 94874.

                Example 3. Add the following numbers:

                             a.  4364 + 1792 + 73645                      b.  20436 + 18369 + 42178

                Solution.  a.        TTh  Th  H T O                       b.       TTh  Th  H T O
                                          1   2  1                                   1      1  2
                                          4  3 6 4                                  2   0   4 3 6
                                          1  7 9 2                                   1  8   3 6 9

                                   + 7    3  6 4 5                               + 4    2   1  7 8

                                      7   9  8 0 1                                  8   0   9 8 3

                Checking Addition
                To check a sum, we add the numbers from the bottom-up. This is called adding up.

                Example 4. Find the sum of the following numbers and check the sum.
                             a.  2736 + 4187 = ?                          b.  56143 + 27682 = ?

                Solution.  a.         Th  H T O                           b.       TTh  Th  H T O
                                      2   7 3 6       Adding                        5 6     1 4 3       Adding

                                   +  4   1 8 7       down                       + 2 7      6 8 2       down

                                      6   9 2 3         Sum                         8 3     8 2 5        Sum

                                      Th  H T O                                    TTh  Th  H T O

                                      6   9 2    3      Sum                         8 3     8 2 5        Sum

                                   +  2   7 3 6       Adding                     + 5 6      1 4 3       Adding
                                      4   1 8 7       up                            2 7     6 8 2       up

                          We get the same sum in both the                    We get the same sum in both the

                          cases. So, the sum is correct.                     cases. So, the sum is correct.

                       28        Mathematics 4

| 25 26 27 28 29 30 31 32 33 34 35 |