Page 59 - MathGenius-C1-Flipbook
P. 59

E:\Working\Orange_Education\Math_Genius_1\Open_Files\Chap_4
               \ 04-Oct-2025  Bharat Arora   Proof-9                                    Reader’s Sign _______________________ Date __________





              2.  Cross out (7) the objects to subtract and find the answer. One has been done
                   for you.


                   (a)                             (b)                               (c)











                             7 – 2 =  5                       6 – 1 =                          4  – 1 =


                   (d)                              (e)                              (f)












                             8 – 4 =                          3 – 2 =                           5 – 3 =



              Subtraction: backward counting


              Kiyara has 15 toys. She gives 9 toys to her brother Kavi.

              Kavi: How many toys are left with you now?

              Kiyara: 6 toys are left with me.

              Kavi: How?
              Kiyara: I subtracted the number of toys I gave you from the total number of toys.

              You can count backwards to subtract. Start from 15 and count back 9 steps as follows:


                                   15     14    13     12     11    10     9      8     7      6

                                       1      2      3     4      5     6      7      8     9

              Similarly, to subtract 5 from 12, we start with the bigger number 12 and count
              backwards 5 steps.

                                                                                             Be Aware
                                          12     11    10      9     8      7       Subtraction is the opposite  of

                                              1      2     3      4      5          addition.  In  addition,  we count
                                                                                    forward  but in  subtraction, we
              Thus,       12 – 5 = 7.                                               count backwards.




              Mathematics-1                                                                                          57
   54   55   56   57   58   59   60   61   62   63   64