Subtracting over tens

74-28= 74 – 20 = 54 54 – 8 = 46
92 – 39 = 92-30=62 62-9= 53
91-54= 91-50=41 41-4= 37
84-56= 84-50=35 35-6= 29
86-59= 86-50=36 36-9= 27
153-68= 153-60=93 93-8= 85
134-65= 134-60=74 74-5= 69
161-74= 161-70=91 91-4= 87
73-58= 73-50=23               23-8= 15
153-27= 153-20=133 133-7= 126
242-73= 242-70=172 172-3= 169
164-48= 164-40=124 124-8= 116
153-25= 153-20=133 133-5= 128
55-39= 55-30=25 25-9= 16
143-31= 143-30=113 113-1= 112
145-26= 145-20=125 125-6= 19

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