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    Example 3. Add: 3018 + 2654 + 2345
                Solution.
                                                                                                       Th H      T O
                Step 1.  Add the ones and regroup.
                                                                                                        1   1    1
                                 8 + 4 + 5 = 17 ones = 1 ten 7 ones                                     3   0    1   8

                Step 2.  Add the tens and regroup.                                                      2   6   5    4

                                 1 + 1 + 5 + 4 = 11 tens = 1 hundred 1 ten                         +    2   3    4   5

                Step 3.  Add the hundreds and regroup.
                                                                                                        8   0    1   7
                                 1 + 0 + 6 + 3 = 10 hundreds = 1 thousand 0 hundreds

                Step 4.  Add the thousands.

                                 1 + 3 + 2 + 2 = 8 thousands

                Therefore, 3018 + 2654 + 2345 = 8017.

                Adding 10, 100 and 1000 to a number

                When 10, 100 and 1000 are added to a number, the digit in its tens, hundreds and
                thousands place increases by 1.

                Examples:  a.         625 +         10 =       635
                                                                              Interesting Facts
                                                                                  The sum of any number and zero
                                b. 3495 +          100 = 3595                   gives the same number.

                                                                                  When 1 is added to a number, the
                                c.   7347 +      1000 =       8347              sum is the successor of the number.

                            Exercise 2D

                    1.  Find the sum.

                        a.        2 3 5 6 b.              6 9 4 5         c.      5 4 2 9         d.       5 0 8 7

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

                        e.        5 4 9 4 f.              3 4 5 4         g.       1  5 6 7       h.       2 5 8 7
                                  1   7 8 7               1   7 8 3               2 4 5 9                  4 7 7 4

                              + 2 0 4 3               + 2 3 2 4                + 4 5 4        1        + 2 3 3 6

                       46        Mathematics 3

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