99﹣30=
19+30=
90﹣17=
46+40=
8+64=
33+8=
23+20=
79﹣70=
59-6=
27+3=
20+55=
5+23=
70-3=
42+8=
13+20=
59-50=
52+20= 62-4= 56 -30= 27+5=
76-30= 9+25 = 46-8= 90+4=
31+5= 6+30= 60-1= 64-50=