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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 __________

                  Subtracting a number from itself

                  When we subtract a number from itself, the difference is 0.
                  (a)  15 – 15 = 0         (b)  28 – 28 = 0          (c) 79 – 79 = 0

                     www
                         MAths connect
                     Makar  Sankranti  is  one of the  most  popular festivals
                     in  India.  Children are celebrating  it  as  Kite Flying            6–1        17–0       16–9

                     Day. Some  kites are flying  in  the  sky. Each  kite has  a
                     subtraction problem. Solve the problems and observe                    21–10         15–15
                     their  answers. If the answer is 0, the kite will  come

                     down, else it goes up.

                     Now, tell the number of kites:

                     Going up =            Coming down =

                  SUBTRACTION ON The NUmBeR lINe

                  Daisy and Bela need to colour the chart papers with different crayons. Daisy has

                  40 crayons. Bela takes away 13 crayons from Daisy and asks her how many crayons
                  are left.

                  Daisy calculates the remaining crayons in the following way.
                  Let us start from 40 and count 13                                    –1  –1 –1 –1 –1  –1 –1 –1 –1  –1 –1 –1 –1

                  steps backward. We reach at 27.                      21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40
                  Thus, 40 – 13 = 27.

                  Bela shows another way. As 13 = 10 + 3, so, starting from 40, take a jump of 1 ten.
                  Then move 3 steps backward.

                  Thus,  40 – 13 = 40 – 10 – 3                         21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40
                                    = 30 – 3 = 27                                      –1  –1 –1

                  Hence, both find 27 crayons are left.

                          Life Skills

                      Riya is counting her body parts. Solve the subtraction sum and know how many
                      parts she counts.
                      1.  I have 20 – 10 = __ fingers. 2. I have 8 – 4 = __ limbs.      3. I have 30 – 29 = __ nose.
                      4.  I have  19 – 9 = __  toes.  5. I have 5 – 3 = __ elbows.  6. I have 33 – 31 = __ eyes.

                  Mathematics-2                                                                                          53

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