Basic HTML Version

|  | Table of Contents |  | View Full Version

Page 33 - Touchpad Mathematics_Ver1.0_C4
P. 33

    Tips

                          We can round a number to the nearest 10 by looking at its ones digit.
                             If the ones digit of a number is less than 5, round the number to the smaller tens.

                             Examples: 21, 22, 23 and 24 round to 20 as their ones digits are less than  5.
                              If the ones digit of a number is 5 or more than 5, round the number to the bigger
                             tens.

                             Examples: 25, 26, 27, 28 and 29 round to 30 as their ones digits are 5 or more
                             than 5.

                                Exercise 1G

                        1.  Use the nearest tens to fill in the blanks.

                           a.    64 lies between ____ and ____                b.   69 lies between ____ and ____

                           c.    75 lies between ____ and ____                d.   89 lies between ____ and ____

                       2.  Write the tens for the given numbers:

                           a.           73                   b.          29                   c.           38

                           d.           48                   e.          56                   f.           85

                       3.  round off the following numbers to the nearest 10.
                           a.  65  _____            b.  89  _____            c.    81    _____           d.    25    _____

                           e.    27    _____        f.   52    _____         g.    73    _____           h.    44    _____

                           i.    36    _____        j.   18    _____         k.    94    _____           l.    33    _____

                       4.  Solve the following:

                           a.    There are 26 pens in a box. Round the number of pens to the nearest 10.

                           b.    A  shopkeeper  sold  74 magazines  in  a  week.  How many  magazines  did  the
                                 shopkeeper sell to the nearest 10?
                           c.    There are 59 passengers in a bus. Round the number of passengers to the nearest
                                 10.

                                                                                                                  31
                                                                                                     Numbers

| 28 29 30 31 32 33 34 35 36 37 38 |