Every time you share fairly, you're doing division. Slicing a pizza, dealing cards, splitting a bill — division is just sharing without any leftovers.
Try it
12 cookies, 4 friends. How many each?
12 ÷ 4 = 3 cookies each. Sharing is just the inverse of multiplication: 4 × 3 = 12.
Remainders are real
13 cookies between 4 friends: 3 each, 1 left over. The leftover is the remainder. Real life is full of remainders.