"roll and write"--use 1/2 sheet of binder paper (long). Each student had a different assignment. They all started the same, but when the reached mastery score 3 days in a row, it was upped. We started with adding both numbers. Some of my kids (2nd/3rd grade) were multiplying with 20 sided dice!
It feels great to roll a critical hit at just the right moment as you are battling your way through a dungeon, but you know what's even better? When your die flashes to celebrate! That's what the Critical Hit Galaxy D20 dice do. Now your crits are even more awesome.