55-50=

60-50=

10-5=

8+50=

99-90=

6+50=

20+10=

3+60=

74-4=

51-1=

19-10=

21-20=

3+5=

14-6=

100-80=

60+5=

2+60=

50-40=

30+30=

90+10=

85-80=

69-9=

12-5=

52-2=

13-9=

5+9=

30+70=

10-2=

44-40=

39-30=

5+8=

20+70=

41-1=

99-9=

100-80=

52-2=

16-8=

33-30=

50+40=

50+10=

45-40=

86-6=

93-3=

100-90=

66-60=

30+70=

9+6=

11-9=

32-2=

64-60=

78-70=

66-60=

39-9=

50+30=

40-10=

20+80=

100-90=

50-30=

70-60=

56-6=

55-50=

61-60=

49-9=

32-2=

58-8=

47-7=

6+50=

8+50=

30+9=

100-80=

5+80=

60+9=

90+7=

13-7=

50-50=

60+20=

4+80=

11-7=

35-30=

4+70=

16-8=

40+6=

40+60=

4+60=

64-4=

64-60=

77-70=

5+30=

9+90=

10+10=

100-90=

5+20=

50+20=

44-4=

80-70=

39-9=

5+70=

1+40=

88-8=

67-60=