Basic HTML Version

|  | Table of Contents |  | View Full Version

Page 46 - Touchpad Mathematics_Ver1.0_C4
P. 46

    3.  Write the numbers in columns and add them.

                        a.   536 + 243 = _______                          b.   326 + 297 = _______

                        c.   399 + 455 = _______                          d.   632 + 398 = _______

                        e.   273 + 189 = _______                          f.   145 + 968 = _______

                Addition oF 4-digit numBErS

                Addition without regrouping

                Example 1. Add 2326 and 4272.
                Solution. Write the numbers in columns and add them.

                Step 1. Add the ones.                       6 + 2 = 8 ones
                                                                                                       Th H      T O
                Step 2. Add the tens.                       2 + 7 = 9 tens                              2   3    2   6

                Step 3. Add the hundreds.                   3 + 2 = 5 hundreds                     +    4   2    7   2
                Step 4. Add the thousands.                  2 + 4 = 6 thousands
                                                                                                       6    5   9    8
                Therefore, 2326 + 4272 = 6598.

                Example 2. Add 2052, 6705 and 130.

                Solution. Write the numbers in columns and add them.
                                                                                                       Th H      T O
                Step 1. Add the ones.                  2 + 5 + 0 = 7 ones
                                                                                                        2   0 5      2
                Step 2. Add the tens.                  5 + 0 + 3 = 8 tens                              6    7   0 5

                Step 3. Add the hundreds.               0 + 7 + 1 = 8 hundreds                     +        1    3   0

                Step 4. Add the thousands.                  2 + 6 = 8 thousands
                                                                                                        8   8   8    7
                Therefore, 2052 + 6705 + 130 = 8887.

                            Exercise 2C

                    1.  Add together:

                        a.       1  2 4 5         b.      3 4 5 0         c.       1  3 4 5       d.      5 9 2       1
                             + 2 6 3 4                + 4 5 4 9                + 6 3 2 3               +   1 0 3 4

                       44        Mathematics 3

| 41 42 43 44 45 46 47 48 49 50 51 |