Basic HTML Version

|  | Table of Contents |  | View Full Version

Page 109 - Touchpad Mathematics V1.0 C1
P. 109

    D:\Working\TouchPad_Maths\TouchPad_Maths_1\Open_Files\Chap_07\Chap_07
                   \ 17-Nov-2025     Surender Singh Rothan   Proof-7                           Reader’s Sign _______________________ Date __________

                       Common Mistakes

                                           T O                                             T O
                                          3 5                                              3 5

                                      + 3                                             +        3

                                          6 5                                             3 8          

                  Example 2. Add: 50 + 4.
                  Solution.

                  Step 1. Add the ones.                                 Step 2. Add the tens.

                                   T O                                                   T O

                                   5 0                                                   5 0

                               +        4                                            +       4

                                        4                                                5 4

                  Thus, 50 + 4 = 54.                                                                    Tips

                                                                        We can add a 2-digit number and a 1-digit
                  Example 3. Add 43 and 6.                              number by breaking up the numbers.
                  Solution.

                  Step 1.  Break  the  bigger  number                   Step 2. Now, add the ones.

                            into tens and ones.                                      43 + 6 = 40 + 3 + 6
                                           43 = 40 + 3                                          = 40 + 9

                  Step 3. Then, add the tens and the ones.

                                              40 + 9 = 49
                   Thus, 43 + 6 = 49.

                              Exercise 7A

                    1.  Solve the following using the number strips.

                         a. 28 + 4 =                      b. 29 + 7 =                     c. 31 + 9 =

                         d. 26 + 5 =                      e. 32 + 6 =

                          21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40

                                                                                                                 107
                                                                                Addition and Subtraction up to 100

| 104 105 106 107 108 109 110 111 112 113 114 |