Right or Left?

Which of these dice are right-handed and which are left-handed?
Exploring and noticing Working systematically Conjecturing and generalising Visualising and representing Reasoning, convincing and proving
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You may know that opposite faces of a dice add up to $7$, but did you know that there are two different types of dice?

Here are two dice, a right-handed one and a left-handed one:

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Right or Left?

Decide whether the dice below are right-handed or left-handed:

Image
Right or Left?

 

Now try these - they are more difficult.

 

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Right or Left?

This problem is taken from the book "Mathematical Activities from Poland" published by ATM.