13+9= 14-7= 57+3=
40+30= 94-50= 89-8=
24+50= 90-30= 64-9=
10+30+40= 70-20-30= 19+(35-5)=
16+( )=25 24+( )=34 35+( )=39
80-( )=70 14-( )=8 50+( )=58