Tihi subtracting h-t-o

Example: 67 -  ? = 34 34 +  ? =  67 34 +  6  = 40 40 + 27 = 67 27 + 6  = 33 So  ? = 33

69 -  ? = 27 27 + ? =  69 27 + 3 = 30 30 + 30 = 60 60 + 9  =69

1. 74 - ?= 22

   74 - 52=22 4. 84 - ? = 54

                         84 - 40 = 54

2. 23 - ? = 13

   23 - 10 =13 5. 57 - ? = 24

                          57 - 33 = 24