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    1.  Find the difference.

                               a.                            b.                                c.

                                     T O                          H    T O                           T O

                                     7   5 plastic bags            1   7   3 paper plates            9    7 napkins
                                –    6   6 paper cups         –        9   7 napkins             –   7    5 plastic bags

                         2.  How many more plastic bags than paper cups were collected?                         _______

                         3.  How many more paper plates than napkins were collected?                            _______

                         4.  How many more napkins than plastic bags were collected?                            _______

                    Exploring Subtraction

                    Like addition, we can also perform subtraction in different ways. Observe some of them.

                    Subtract by counting Forward on a number line

                    Example. Subtract 48 from 62 using the number line.

                    Solution. Locate 48 on the number line and count up from 48 to 62.

                                                                2 + 10 + 2 = 14
                    So, 62 – 48 = 14.

                    breaking the Smaller number

                    For quick subtraction, the smaller number is broken up into parts.

                    Jaideep and Swati together have a total of 74 coins. If Jaideep has
                    32 coins, how many coins does Swati have?

                        74  -  32  =  ?                  74  –  30  =  44           Can you breakup
                                                                                    32 in other way?

                            30  +  2                     44  –    2  =  42

                    So, 74 – 32 = 42
                    Thus, Swati has 42 coins.

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     Mathematics 3                                                                                Subtraction

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