28×5= 100÷4×5= 4×25÷4×25= 700÷35=
81×5×2= 66×32-( )=480 7200÷4÷25= 900-129=
(80+8)×125= 57800÷80=
5÷0.02= 37.6-25.8= 234÷3= 45×7%=
2.4×2.5= ×5.6= ÷ = + =