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    D:\Working\TouchPad_Maths\TouchPad_Maths_1\Open_Files\Chap_04\Chap_04
                   \ 17-Nov-2025     Surender Singh Rothan   Proof-7                           Reader’s Sign _______________________ Date __________

                      3.  Match the envelopes that give the same answer.

                                    8                       9                       12                      9

                                 –  3                    –  3                     –  2                    –  2

                                    8                       11                       5                     16
                                 –  2                     –  1                    –  0                   –  9

                      4.  Subtract.

                           a.                      b.                       c.                      d.
                                      T O                     T O                     T O                     T O

                                      1   7                   1   5                   1    3                  1    8

                                 –        3              –        4               –       0               –        1

                      5.   Anjali  has  18 toffees.  She gives                        T O
                           4 toffees to her sister, Anita. How                         1 8

                           many toffees are left with her?
                                                                                  –        4
                                  toffees

                      6.  Monu, a fisherman has 17 fish. He                           T O
                           puts 6 of them back in the water.                           1 7
                           How many fish are left with Monu?                      –        6

                                  fish

                                                                                                  Mental Maths

                    think and write.                                                                    Century   #Critical Thinking
                                                                                                         21 st
                                                                                                        Skills
                      1.  8 – 7 =     1                  2.  9 – 8  = _______
                                                                                            remember
                      3.  2 – 1  = _______               4.  6 – 5  = _______         When we subtract the
                                                                                        number just before
                      5.  7 – 6 = _______                6.  4 – 3  = _______          a given number, the
                                                                                        answer is always 1.
                      7.  5 – 4 = _______                8.  10 – 9 = _______

                                                                                                                  65
                                                                                           Subtraction up to 20

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