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Page 75 - Math Genius C2
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    E:\Working\Orange_Education\Math_Genius_2\Open_Files\Chap_04
                   \ 26-Sep-2025  Bharat Arora   Proof-10                                   Reader’s Sign _______________________ Date __________

                  Addition of 3-digit numBers with regrouping

                  Nobita: There is a charity event in our school

                  for flood-affected people. I have collected
                  265 items of clothing including shirts

                  and trousers from my area.

                  Shizuka: I have also collected

                  398 dresses from my area.

                  Doraemon: You both have

                  collected 663 items of

                  clothing.

                  Nobita: How do you calculate that, Doraemon?

                  Doraemon: To know the total number of clothing items, we need to add 265 and

                  398. We can do this step by step as shown here.

                  Step 1.  Add the ones and regroup.                                              H    t    O

                                                                                                       1
                  5 + 8 = 13 ones                                                                 2    6    5

                         =  1 ten + 3 ones                                                    +   3    9    8
                                                                                                            3
                  So, write 3 in the ones column and carry over 1

                  to the tens column.

                  Step 2.   Add the tens and regroup.                              Step 3.  Add the hundreds.
                  1 + 6 + 9 = 16 tens                                              1 + 2 + 3 = 6 hundreds

                              = 1 hundred + 6 tens                                   So, write 6 in the hundreds
                    Now, write 6 in the tens column and carry                      column.

                  over 1 to the hundreds column.                                       H    t    O
                                       H     t   O                                     1    1

                                        1    1                                         2    6    5
                                        2    6    5                                +   3    9    8
                                    +   3    9    8                                    6    6    3

                                             6    3

                  Thus, 265 + 398 = 663.

                  Mathematics-2                                                                                          73

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