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    E:\Working\Focus_Learning\Math_Genius_1_(05-10-2023)\Open_Files\02_Chap_2\Chap_2
                   \ 11-Sep-2024  Bharat Arora   Proof-6                                    Reader’s Sign _______________________ Date __________

                  Numbers oN the AbACus                                                           Tens Ones

                  Look at the picture shown alongside. It is an abacus.
                  We use an abacus with two spikes to show 2-digit                      It is                       It is

                  numbers.                                                             for tens.                 for ones.
                                                                                                    t     O
                  Let us show some 2-digit numbers on the abacus.

                     10 has 1 ten and 0 ones.   15 has 1 ten and 5 ones.   18 has 1 ten and 8 ones.

                                t    O                             t    O                             t    O

                       1 bead in tens spike               1 bead in tens spike               1 bead in tens spike

                       shows 1 ten and no             shows  1 ten and 5 beads  shows 1 ten and 8 beads
                       beads in ones spike              in ones spike means 5              in ones spike means 8
                          means 0 ones.                            ones.                              ones.

                           Practice time 2d

                  1.   Complete the table. One has been done for you.

                                              (a)                (b)                 (c)                (d)

                        Abacus
                                                    t    O             t     O             t    O             t    O

                                                    1    7

                        Number                        17

                        Number Name              Seventeen

                  2.   Draw the beads to show the given numbers.

                        (a)                      (b)                     (c)                      (d)

                                 t    O                   t    O                   t    O                   t    O
                                   12                       16                      11                       19

                  26                                                                                     Mathematics-1

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