Basic HTML Version

|  | Table of Contents |  | View Full Version

Page 47 - Touchpad Mathematics_Ver1.0_C4
P. 47

    2.  Add the following:

                           a.       2 4 5 3          b.      2 2 0 1          c.      2   1   3   1   d.      3 4 0 4

                                    4 3 2 2                  2 3 3 4                  6 3 4 5                 1 0 8 3
                                +   1   1  2 4            +   1  4 2 5             +  1   4 0 2            +      2   1  2

                       3.  Write the numbers in columns and find the sum.

                           a.  1622 + 3104                   b.  6345 + 2032                  c.  1220 + 2102

                           d.  6735 + 3143                   e.  3456 + 1243                  f.   5440 + 3432

                           g.  3045 + 1242                   h.  2814 + 3152                  i.   7345 + 2654

                           j.   6625 + 2163                  k.  1501 + 1242                  l.   5302 + 3453

                           m.  4031 + 1056 + 200             n.  2444 + 1134 + 2110           o.  5333 + 1120 + 2020

                    Addition with regrouping

                    Example 1. Add: 4549 + 3422
                    Solution. Write the numbers in columns correctly and add them.

                    Step 1.  Add the ones and regroup.
                                                                                                          Th H      T O
                                                    9 + 2 = 11 ones = 1 ten 1 one
                                                                                                                    1
                    Step 2.  Add the tens.                  1 + 4 + 2 = 7 tens
                                                                                                           4    5   4    9
                    Step 3.  Add the hundreds.                 5 + 4 = 9 hundreds                      +   3    4   2    2

                    Step 4.  Add the thousands.                4 + 3 = 7 thousands
                                                                                                           7    9   7    1
                    Therefore, 4549 + 3422 = 7971.

                    Example 2. Add: 8456 + 1345

                    Solution. Write the numbers in columns correctly and add them.

                    Step 1.  Add the ones and regroup.

                                                    6 + 5 = 11 ones = 1 ten 1 one
                                                                                                          Th H      T O
                    Step 2.  Add the tens and regroup.
                                                                                                                1   1
                                                1 + 5 + 4 = 10 tens = 1 hundred 0 tens
                                                                                                           8    4   5   6
                    Step 3.  Add the hundreds.              1 + 4 + 3 = 8 hundreds
                                                                                                       +   1    3   4    5
                    Step 4.  Add the thousands.                 8 + 1 = 9 thousands
                                                                                                           9    8   0    1
                    Therefore, 8456 + 1345 = 9801.

                                                                                                                  45
                                                                                                     Addition

| 42 43 44 45 46 47 48 49 50 51 52 |