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    E:\Working\Orange_Education\TouchPad_Maths_4\Open_Files\Chap_03\Chap_03
                     \ 10-Nov-2025  Bharat Arora   Proof-8                                    Reader’s Sign _______________________ Date __________

                                Exercise 3F

                        1.  Estimate the following products by rounding each number to the nearest 10.

                           a.  14 × 36       =  ____       b.  75 × 33      =  ____        c.  44 × 41     = ____

                           d.  78 × 82       =  ____       e.  42 × 68      =  ____        f.  53 × 31     = ____

                           g.  397 × 26      =  ____       h.  154 × 18     =  ____        i.  327 × 46  = ____

                           j.   263 × 124  =  ____         k.  127 × 268  =  ____          l.  133 × 527  = ____

                       2.  Estimate the following products by rounding each number to the nearest 100.

                           a.  109 × 267 = _____           b.  445 × 123 = _____           c.  198 × 364 = _____

                           d.  176 × 248 = _____           e.  325 × 278 = _____           f.  190 × 127 = _____

                           g.  235 × 168 = _____           h.  154 × 356 = _____           i.  204 × 320 = _____

                    WorD ProBlEMS

                    Example 1. A box contains 144 mangoes.

                    Find the number of mangoes in 208 such boxes.                                         TTh  Th  H T O
                                                                                                                  1 4 4
                    Solution. Number of mangoes in a box = 144
                                                                                                       ×          2 0 8
                    Number of boxes = 208
                                                                                                               1  1 5 2
                    Number of mangoes in 208 boxes  = 144 × 208                                               0   0 0 0
                                                               = 29952                                 +   2  8   8 0 0

                    Therefore, the total number of mangoes in 208 boxes                                    2  9   9 5 2
                    is 29952.

                    Example 2. The price of an earring is `64.

                    Find the total cost of 99 earrings.                                                       Th  H T O

                    Solution. Cost of an earring = `64                                                               6 4
                    Number of earrings = 99                                                                ×         9 9

                    Cost of 99 earrings  = `64 × 99                                                               5 7 6
                                            = `6336                                                        +  5   7 6 0

                    Therefore, the total cost of 99 earrings is `6336.                                        6   3 3 6

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