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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 __________

                                                                                              Mental Maths

                Choose the correct option.                                                   Century   #Computational Thinking
                                                                                               21 st
                                                                                              Skills
                    1.  100 × 100 = ___________
                        a.  20000                b.  1000                 c.  10000                d.  200

                    2.  100 × 25 × ___________ = 0
                        a.  3                    b.  1                    c.  0                    d.  10

                    3.  (42 × 16) × 8 = 42 × (16  × ___________)
                        a.  8                    b.  7                    c.  6                    d.  10

                    4.  35 × 700 = ___________
                        a.  75,000               b.  35,000               c.  24,500               d.  23,500

                  5.  48 × (24 × ___________ ) = (48 × 24) × 20
                        a.  70                   b.  20                   c.  24                   d.  48

                  6.  ___________ × 1000 = 1000 × 9999
                        a.  99                   b.  999                  c.  9999                 d.  99,999

                    7.  65 × 0 × 287 = ___________
                        a.  0                    b.  1331                 c.  10                   d.  1

                                                                                                       HOTS
                                                                                                    21 st
                                                                                                   Century   #Critical Thinking
                What will come in place of '?' in the diagram?                                     Skills
                                                                                    5      8

                                                                              3    16     80    12

                                                                              34   427     ?    16

                                                                                   27     21

                  A Pinch of History

                  The multiplication symbol (x) is actually called the cross of San Andreas. The symbol was
                  first used in maths in the 16th century and the credit goes to William Oughtred, an English
                  mathematician, for first using the cross of San Andreas to represent the multiplication of
                  two numbers.

                       58        Mathematics 4

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