4kg= g 100dm2= cm28km24m= m 90000cm2= m2290mm= cm 56000g= kg350kg﹣300g= g 40m2+300dm2= m2.
= ÷25=0.6= ÷45.
= :10= %=24÷ = (小数).
: == %= :35= 成= (小数)
:5= (填小数)= ÷10= %=.
=7÷8== (填小数)