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

                  FINDING The mISSING NUmBeR

                  example 1: What should be added to 5 to get 13?
                  Solution:  We have 5 +  _____ = 13

                                  We can figure out the missing number by thinking about a subtraction
                                  fact in the same family.

                                  Think         13 –  5 = _____

                                  We know that 13 – 5 = 8 and we also know that 5 + 8 = 13.
                                  So, 8 should be added to 5 to get 13.

                  example 2: What should be subtracted from 16 to get 9?

                  Solution:   We have 16 – _____ = 9
                                  Since        16 – 9 = 7, we know that 16 – 7 = 9.

                                  So, 7 should be subtracted from 16 to get 9.

                        activity                                                                                Logical Thinking
                                                                                                     Experiential Learning
                    Count the dots on the given cards. then draw the missing dots to
                    complete the fact.

                    1.          –         =                            2.          –         =

                    3.          –         =                            4.          –         +        =

                           Practice Time 3F

                  1.  Complete the addition facts using a related subtraction fact.

                       (a) 9 + _____ = 14               (b)  7 + _____ = 13              (c)  11 + _____ = 17

                       (d) 14 + _____ = 17              (e)  _____ + 8 = 14               (f)  _____ + 14 = 36

                  2.  Complete the subtraction facts using a related addition fact.

                       (a) _____ – 3 = 6                (b)  _____ – 8 = 9               (c)  _____ – 10 = 14

                       (d) _____ – 8 = 13               (e)  _____ – 4 = 9                (f)  _____ – 19 = 24

                  3.  Complete the subtraction facts using a related subtraction fact.

                       (a) 17 – _____ = 9               (b)  13 – _____ = 8              (c)  14 – _____ = 10

                       (d) 20 – _____ = 12              (e)  28 – _____ = 21              (f)  26 – _____ = 19

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