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    E:\Working\Brother_Education\Foundational_Stage_Maths-2_(11-09-2024)\Open_Files\Chap_03
                   \ 02-Nov-2023  Bharat Arora   Proof-1                                    Reader’s Sign _______________________ Date __________

     Estimating Difference  example 2:  There are 52 seats in a bus. 35 passengers are sitting in the bus. How
                                    many seats are vacant?
     To estimate the difference, we round off each number to the nearest tens and then   Solution:
                                                                                              O
     subtract the rounded-off numbers.  To find the number of vacant seats in             t   12
                                    the bus, we subtract 35 from 52. So,
                                                                                          4
     example 2: Estimate the difference between 69 and 24.     52 – 35 = 17 seats         5    2

     Solution:  When we estimate the difference between 69 and 24, we subtract the      So, 17 seats are vacant in the bus.  –  3  5

     tens (70 – 20) and say the difference is about 50.  Practice Time 3h                 1    7
     Actual   estimated
     sum  sum     Study the story sums and solve them.
     6  9  Rounded up  7  0

     –  2  4  Rounded up  –  2  0  1.  There are 29 balls in the big box and 14 in the   t   O

     4  5  5  0        small box. How many more balls are there in big
                       box than small box?                                          –
        Actual difference = 45 but estimated difference = 50.
                       Answer: __________________
     Practice Time 3G                    2.  There are 26 students in a section of class 2.                       t    O

     Find the actual and the estimated sum and difference by rounding off the numbers   15 of them like cartoon shows. How many

     to the nearest 10. Compare the actual and the estimated sum and difference and   students do not like cartoon shows?  –

     fill <, > or = in the given blank space.      Answer: ________________________
     1.  t  O  H  t  O  2.  t  O  H  t  O  3.  There are 28 books in a shelf. 9 of them are   t   O

     3  2  round off  8  7  round off  storybooks. How many are other types of
     + 6  6  round off  +  – 2  2  round off  –  books?                                  –
                       Answer: __________________

       Actual Sum__________Estimated Sum  Actual Difference____Estimated Difference
                                    4.  Puja and Sony like to collect stamps. Puja has 56                         t    O
     SUBTRACTION STORIeS                 stamps and Sony has 48 stamps. Who has more

     example 1:  Priya has 15 kites and Saransh has 11 kites. Who has more kites and   stamps and by how many?  –
     how many?                           Answer: ________________________

     Solution:   Priya has  15  kites.         Saransh has  11  kites.

        We first compare 15 and 11.                                                     t    O

        Clearly, 15 > 11, so Priya has more kites.  t  O  5.  A box contains 45 DVDs. Out of them, 12 are

        Now, we find the difference.  1  5     music DVDs. How many are non-music DVDs?  –
        15 – 11 = 4 kites  –  1  1  Answer: __________________

        So, Priya has 4 more kites than Saransh.  4

                  Mathematics-2                                                                                          65

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