Basic HTML Version

|  | Table of Contents |  | View Full Version

Page 56 - Math Genius C2
P. 56

    E:\Working\Orange_Education\Math_Genius_2\Open_Files\Chap_03
                   \ 26-Sep-2025  Bharat Arora   Proof-10                                   Reader’s Sign _______________________ Date __________

                  SUBTRACTION ON A NUmBeR GRID

                  Anna wanted to surprise her mother on Mother’s

                  Day. She baked 56 apple pies.

                  Mother was very happy with Anna's pies. She invited

                  her neighbours to eat pies.

                  They managed to eat 24 pies in all.

                  Now, Anna wants to know how many pies are left.

                  For this, Anna uses a 100-number grid.
                                                                                 1    2   3   4    5   6   7   8    9  10
                  To subtract numbers on a number grid, she finds                11 12 13 14 15 16 17 18 19 20

                  the bigger number first, that is, 56. Then, she                21 22 23 24 25 26 27 28 29 30

                  moves up 2 rows (– 20) and reaches 36.                         31 32 33 34 35 36 37 38 39 40

                  From 36, she moves left 4 steps (– 4). Finally,                41 42 43 44 45 46 47 48 49 50

                  she reaches 32. Hence, 56 – 24 = 32.                           51 52 53 54 55 56 57 58 59 60
                                                                                 61 62 63 64 65 66 67 68 69 70

                          32       33        34       35       36                71 72 73 74 75 76 77 78 79 80

                               –1       –1       –1        –1                    81 82 83 84 85 86 87 88 89 90
                                                                  –10
                              Math Insight                                       91 92 93 94 95 96 97 98 99 100
                    On a number grid like the one shown        46
                    here, to subtract ones, we move                                  Fast Check
                    leftwards and to subtract  tens, we           –10
                    move upwards.                              56                  Use the number grid to subtract.

                                                                                   1.  26 – 4  =

                  Thus, 32 pies are left with Anna.
                                                                                   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

| 51 52 53 54 55 56 57 58 59 60 61 |