additior facts

 19 + 18 =37                    12 + 14 = 26                       13 + 15=28                                 9 + 17=26

 18 + 19 =37                     26 -14 =12                         28 - 15 =13                                 26 - 17 =9

 37 -  19 =18                     26 -12 =14                        28 -13 = 15                                  26 - 9 =17

37 -   18= 19                     14 + 12 = 26                    15+13 = 28                                   17 + 9 =26




23 + 21 =44                         25 + 26 =41                                 27 + 23 =50                            21 + 25 =46

21 +23 =44                          26 + 25 =41                                  23 + 27 =50                            25 + 21 =46

44 -21 =23                           41 -  26 =25                                  50 - 23 =27                             46 + 25 =21

44- 23 =21                           41 - 25 =26                                   50 - 27 =23                             46 - 21 =25

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