81:

How many centimeters would each planet be from the Sun if we said that 1 cm = 1,000,000 km?

For extra credit, bring in a cut out or diagram of the size of up to 5 planets in cm. Again, our model will have a scale of 1 cm = 1,000,000 km. 

Planet	Diameter (km)	Kilometers from Sun (multiplied by 1,000,000)
Mercury	4,879	57.9
Venus	12,104	108.2
Earth	12,756	149.6
Mars	6,794	227.9
Jupiter	142,984	778.6
Saturn	120,536	1433.5
Uranus	51,118	2872.5
Neptune	49,528	4495.1