∵1m=100cm,∴8844.43m=8844.43×100cm=884443cm.
(2)∵1g=103mg,∴500g=500×103mg=5×105mg;
∵1g=10-3kg,∴500g=500×10-3kg=0.5kg;
∵1g=10-6t,∴500g=500×10-6t=5×10-4t;
(3)∵1s=
∵1s=
故答案為:
(1)8.84443;884443;
(2)5×105;0.5;5×10-4;
(3)30;0.5.