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    E:\Working\Focus_Learning\Math_Genius_1_(05-10-2023)\Open_Files\06_Chap_6\Chap_6
                   \ 11-Sep-2024  Bharat Arora   Proof-6                                    Reader’s Sign _______________________ Date __________

                  BIGGER NUMBERS oN ABAcUS                                                         A spike cannot have
                                                                                                    more than 9 beads.
                  We know that two spiked abacus is used to

                  represent a 2-digit number.
                  Let us show the number 59 on the abacus.                             t    O

                  It has 5 tens and 9 ones.                                            5    9
                  So, we put 9 beads in ones spike and 5 beads in tens spike as shown alongside.

                  WhAT coMES AfTER, BEfoRE oR BETWEEN

                  Look at the table below.

                               Before                            Between                              After
                    The number that                    The number in                      The number that

                    comes just before is               between is one less                comes just after is
                    always 1 less than the             than the next number               always 1 more than the
                    given number.                      and one more than the              given number.

                                                       previous number.

                                  65               –1                66               +1               67

                  Look at the number line.

                                           Before                   After

                                 64          65          66          67         68          69          70
                                                      Between

                         65 comes just before 66 (65 is 1 less than 66).

                         67 comes just after 66 (67 is 1 more than 66).
                         So, 66 lies between 65 and 67.

                           Think and Answer

                         What number between 60 to 69 has the digit in the ones place 1 more than the digit in
                         the tens place?

                                                                   tens Ones

                         Also, write the numbers between which the above number lies.

                   Teacher’s   Using a tailor/number tape, explain the children what comes just before, just after a number or what comes
                      Tip      between two numbers.

                  92                                                                                     Mathematics-1

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