300÷125÷8
=300÷(125×8)
=300÷1000
=0.3
396-96-172-28
=(396-96)-(172+28)
=300-200
=100
125*24
=125*8*3
=1000*3
=3000
360÷24
=360÷6÷4
=60÷4
=15
240÷48
=240÷24÷2
=10÷2
=5
800÷32
=800÷8÷4
=100÷4
=25
27+456+73
=(27+73)+456
＝100+456
＝556
24÷4+56÷4
＝(24+56)÷4
＝80÷4
＝20
2.5×0.7×0.8
＝(2.5×0.8)×0.7
＝60×0.7
＝42
