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    2

                                                                      Addition

                        LEARNING ObjEctIvEs

                         After studying this chapter, students will be able to...

                            y  add 3-digit numbers without and with regrouping
                            y  add 4-digit numbers without and with regrouping
                            y  evaluate and estimate the sum
                            y  solve word problems based on addition

                                                                                                    21 st
                                                                                                   Century   #Life Skills and Values
                                                                                                   Skills
                        Warm Up                           Building of Hundreds

                       A courier boy has to deliver parcels in an apartment complex.

                       The numbering of buildings and flats is as follows:

                       The apartment building with flats 0–99 is termed as the ZERO BUILDING.

                       The building with flats 100-199 is termed as the ‘100 BUILDING’.

                       The building with flats 200-299 is termed as the ‘200 BUILDING’
                       and so on. The last building is the ‘900 BUILDING’.

                       The flat numbers are written in different ways on the parcels.

                                            3 flats        10 flats        10 flats         15 flats       A flat just
                           100 + 9
                                           after 379                                                      above 638
                                                          after 540        after 220       after 725

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                                                                                                     Addition

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