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    E:\Working\Brother_Education\Preparatory_Stage_Maths-3_(11-09-2024)\Open_Files\CHAP_02
                 \ 02-Nov-2023               Sonia Suyal   Proof-1                            Reader’s Sign _______________________ Date __________

                  Addition of three 3-digit numbers

                  Adding three 3-digit numbers is the same as the addition of two 3-digit numbers.

                  Let us add 217 + 342 + 153. Arrange the numbers in place value columns and follow the

                  given steps:
                  Step 1: Add the ones.                                                                      H    t    O

                           7 + 2 + 3 = 12 ones = 1 ten + 2 ones.                                              1   1

                           Write 2 in ones column and carry over 1 ten in the tens column.                    2   1    7
                  Step 2: Add the tens.                                                                       3   4    2
                                                                                                          + 1     5    3
                           1 (carried over) + 1 + 4 + 5 = 11 tens = 1 hundred + 1 ten.                        7   1    2

                           Write 1 in the tens column and carry over 1 hundred in the
                           hundreds column.
                  Step 3: Add the hundreds.

                           1 (carried over) + 2 + 3 + 1 = 7 hundreds.

                           Write 7 in the hundreds column.
                           Thus, 217 + 342 + 153 = 712.

                           Think and Answer
                        Find the missing numbers in the blocks of addition                            182
                        pyramid.
                        Hint: Each block except the bottom row has the sum                            48
                        of the two numbers below it.                                         20    26    22     18

                           practice time 2B

                  1.  Add the following and tell at which place will you need regrouping in the following
                       addition.

                       (a)     H    t   O               (b)     H    t   O               (c)     H    t   O
                               7    0   9                       5    2   3                       7    8    5
                            + 1     0   4                    + 1     8   3                    + 1     1    5

                  2.  Find the sum of the following.
                       (a)     H    t   O               (b)      H   t    O              (c)     H    t   O

                               2    4   7                        5   4    9                      3    5    8
                            + 3     3   5                    + 3     6    4                   + 2     7    0

                  Mathematics-3                                                                                          35

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