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    Operations with

                                     2                                               integers

                                               computational thinking quest

                    Tick ( ) the correct option.

                      1.  A grid with several numbers is provided below.     (income) that can be included in the budget,
                         Follow the steps outlined until all numbers are     while ensuring that the total sum is still zero?
                         struck.                                                                        (Critical Thinking)

                         Step 1: Circle any number in the magic number              (a)  1              (b)  2
                         grid.
                                                                                    (c)  4              (d)  5
                         Step  2: Strike  out  the  row and  the  column
                         containing that number.                          3.  If S is the sum of integers from –100 to 102,
                                                                              find S.               (Pattern Recognition)
                         Step 3: Circle any unstruck number.

                         When there is no unstruck  number, stop.                   (a)  0              (b)  203
                         Multiply  the circled  numbers. What answer
                                                                                    (c)  102            (d)  201
                         do you get?            (Algorithmic Thinking)
                                                                          4.  You have a set of 50 integers. If the product
                                     9   -18  27  -36                        of any 3 integers in the set is negative, what
                                                                             is the maximum number of positive integers
                                    -6   12  -18   24
                                                                             that could be in the set?   (Logical Thinking)
                                     4   -8   12  -16
                                                                                    (a)  0              (b)  1
                                    -5   10  -15  20
                                                                                    (c)  2              (d)  3
                               (a)  25230           (b)  24920            5.  A fish is at  20 m below sea  level. It sees  a
                                                                             worm at 5 m below see level. To eat the worm,
                               (c)  25920           (d)  25000               the fish must move:     (Analytical Thinking)

                      2.  You are balancing a budget for a community                (a)  –15 m above
                         project.  You  have five different  amounts  of
                         money, and the total sum of all the amounts                (b)  15 m above

                         is zero. Some amounts are positive (income)                (c)  15 m below
                         and some  are negative  (expenses).  What  is
                         the  maximum number  of positive  amounts                  (d)  25 m above

                     42        Computational Thinking-7 (Mathematics)

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