When you split crystals equally among robots, you were doing DIVISION! 12 crystals shared among 3 robots = 4 each. That's 12 ÷ 3 = 4! And when there were leftovers that couldn't be shared fairly? That's called a REMAINDER! 17 shared among 4 = 4 each with 1 left over. You use this every time you split a pizza, share treats, or divide up jobs at home!