306×5= 270×3= ★140+208+312=
86-37+455 280-7×9 (343-295)÷8
40×6=
30×8=
420÷6=
(34+38)÷9=
24×4=
6×4+23=
330÷3-70=
9×(49-39)=
408×31200 402×5402×7 209×61000
280×3900 400×52000 180×71400