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Most of what dice get used for in a lesson involves the total — build an equation from these numbers, move that many, decide between two activities on whether the sum passes something. A roller that shows only pips makes thirty children do the addition before the activity starts.
So the faces are large and the total is under them, both readable from the back.
Because a d20 is genuinely useful for a number line and a d4 is useful for groups, and neither is in the drawer when you want it. Sound is off by default; a rattle thirty times in a lesson wears out quickly.
Up to eight at once, with four, six, eight, ten, twelve or twenty sides.
Yes, underneath the faces, whenever more than one die is rolled.
It is off by default and there is a button to turn it on.