①128×69=
②52×320=
③816÷51=
④880÷64=
⑤★314×27=
⑥★968÷16=
□×□-□
□×□○□=□
40×25%= 1.03×10= 3×45= 1÷10%= 2.8×=
1.57﹣0.85= 0.49÷0.7= 3.05+6.2= 0.6:0.75= kg:40g=