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    cbse handbook questions

                      Tick ( ) the correct option.
                      1.  Form the largest  four-digit  odd  number  by     4.  The given grid is to be filled with distinct single-
                         selecting exactly one digit from each row and       digit natural numbers such that:
                         each column. What is the sum of the digits?
                                                                                • The sum of each row is the same and is an
                                      7   4   5  3                              even number

                                     6    9   2  6                              • The  larger  number in each column is
                                                                                placed in the red block
                                     5    1   3  2
                                                                             What is the sum of the numbers in the white
                                      8   9   7  4                           blocks?

                               (a)  21              (b)  22                                      7

                               (c)  23              (d)  24                             4    8
                      2.  Each square of the given puzzle must be filled
                         with a single-digit natural number such that:             (a)  16              (b)  17
                            • The sum of all four different digits in each
                            row and each column is 10                              (c)  15              (d)  20
                            • All the inequality signs (< and >) between
                            the boxes must be followed                    5.  Given below is a 3 x 3 grid to be filled by num-
                         Find the correct values of A and B.                 bers from 1 to 9 such that:
                                                                                • Every pair of adjacent digits in a row should
                                       1              4
                                                                                have a difference of three
                                       2    B         A                         • Some of the numbers have already been
                                                                                placed
                                            3
                                                                             Based  on the  given conditions,  choose  the
                                                 2                           correct option.

                               (a)  A = 3, B = 4     (b)  A = 2, B = 1                        1

                               (c)  A = 1, B = 4     (d)  A = 3, B = 1                            5
                      3.  How many cells contain a digit equal to the                                 9
                         sum of all the other digits in its corresponding
                         row and column combined?                                  (a)  A  row can have all numbers  as

                                      3          6                                     even
                                      1   2   3                                    (b)  A row can have all numbers as odd
                                          4      2

                                      5          1                                 (c)  A row can have 2 even and 1 odd
                                                                                       number
                               (a)  2               (b)  3
                                                                                   (d)  All of these
                               (c)  4               (d)  5

                                                                 Answers

                                                    1. (c)   2. (d)   3. (c)    4. (a)   5. (c)

                     32        Computational Thinking-7 (Mathematics)

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