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'Two Dice' printed from http://nrich.maths.org/
Why do this problem?
provides a valuable experience for younger pupils to explore some simple additions while finding all possibilities.
What children need to know to play this game
The children need to be able to roll two dice and identify their score.
Using a dice with dots on, encourage discussion as to what numbers are represented by the faces of the dice before introducing the challenge itself.
You could support the children to collect their totals on the board. Ask them how they should be arranged and see if they can suggest a systematic way of recording their results. For example, they might start with all the totals that use a $1$. In this way, you can ask the class to talk about the patterns they notice and this will help to reveal any combinations that are missing.
These questions have been phrased in ways that will help you to identify the children's prior knowledge about both the number concepts involved and the strategies and mathematical thinking needed to solve the problem.
Can you make a bigger/smaller total?
What is the highest total you could make?
What is the lowest total you could make?
If one dice shows $6$, what could the other dice be showing?
How will you know when you've found all the totals?
You could make use of more dice and/or dice with different numbers of faces. Alternatively, consider finding the difference between the two numbers or the product of the two numbers.
Children who struggle with addition may count the dots to help them but encourage them to articulate the number sentence once they have done so. This will help them to build the visualisations of the numbers as dotty dice patterns which will support their learning of number bonds.