Watermelons

These watermelons have been entered into a competition. Use the information to work out the number of points each one was awarded.
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Watermelons


 
 
Here are three watermelons.
The one in the front of the picture weighs 7.35kg.
The one on the left of the picture weighs 8.20kg.
The one on the right of the picture weighs 6.45kg.

 
 
In a melon-growing competition, a melon is awarded a point for each gram that it weighs.

How many points does each melon gain?

Can you explain how you worked this out?