300+600= 536+8= 541-3= 190+( )=200
900-700= 800+200= 620+30= 6+( )=312
130+260= 563-6= 760-720= ( )+563=863
237+6= 580-200= 930-580= 273-( )=203
760-290= 109+5= 1000-20= ( )-180=220
①367+347=
②186+295=
③483-275=
④963-546=
①532+188=
②328+467=
③865+135=
④903-485=
⑤617-429=
⑥700-437=