Page 80 - บทที่ 1
P. 80

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                                                 5 + 6 =                        13 - 5 =


                 1 +4 =                           6 - 3 =                         9x7 =



                  9x3 =                           6 + 2 =                         8 + 5 =



               11 - 3 =                          6 + 7 =                          7x8 =


                 5 + 9 =                          5x5 =                           1x6 =



                 1 - 1 =                         7 - 3 =                          3 + 9 =


                  9x1 =                           7x6 =                           8 - 1 =



                 3 + 1 =                       14 - 5 =                           4x2 =



               15 - 7 =                           4 + 8 =                       11 - 5 =


                  7x7 =                           8x3 =                           3 + 6 =



               12 - 5 =                           1 + 8 =                         5 + 9 =



                 8 + 2 =                       14 - 6 =                         14 - 9 =


                 8 - 4 =                         9 - 9 =                          5x7 =



                 9 + 5 =                          8x8 =                           7 - 6 =



                 5 + 0 =                         8 + 7 =                          8x7 =


                  8x6 =                        17 - 9 =                           4x7 =



               16 - 8 =                           3x7 =                           2 + 4 =
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