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    E:\Working\Focus_Learning\Math_Genius_2_(09-10-2023)\Open_Files\Chap_03
                   \ 16-Feb-2024  Bharat Arora   Proof-6                                    Reader’s Sign _______________________ Date __________

                  SUBTRACTION ON A NUmBeR GRID

                  Anna wanted to surprise her mother on Mother’s
                  Day. So, she baked 56 apple pies.

                  When she served it to her mother, she became
                  glad. Mother invited her neighbours also to eat

                  pies.

                  They managed to eat 24 pies in all.
                  Now, Anna wants to know how many pies are

                  left.                                                          1    2   3   4    5   6   7   8    9  10

                  For this, Anna uses a 100-number grid.                         11 12 13 14 15 16 17 18 19 20
                                                                                 21 22 23 24 25 26 27 28 29 30
                  To subtract numbers on a number grid, she finds
                  the bigger number first, that is, 56 then moves                31 32 33 34 35 36 37 38 39 40

                  upward 2 rows (– 20) and reaches up to 36.                     41 42 43 44 45 46 47 48 49 50
                                                                                 51 52 53 54 55 56 57 58 59 60
                  From 36, she moves left 4 boxes (– 4). She                     61 62 63 64 65 66 67 68 69 70
                  reaches finally to 32. Hence, 56 – 24 = 32.
                                                                                 71 72 73 74 75 76 77 78 79 80

                          32       33        34       35       36                81 82 83 84 85 86 87 88 89 90
                               –1       –1       –1        –1                    91 92 93 94 95 96 97 98 99 100
                                                                  –10
                               Remember                        46
                    On a number grid, to subtract ones, we                           Quick Check
                    move leftward and to subtract tens, we        –10              Use the number grid to subtract.
                    move upward.
                                                               56                  1.  26 – 4  =

                  Thus, Anna has left 32 pies.                                     2.  58 – 17 =

                           Practice Time 3A

                  1.  Fill in the blanks.

                       (a)       22 – 0 =              (b)       31 –        = 31        (c)       67 – 67 =

                       (d)       93 –         = 0       (e)      57 – 1 =                (f)       88 –        = 87

                  54                                                                                     Mathematics-2

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