In math we are learning about money and the value of money. I came across this experiment, which brought me back to my school years. Kids have to estimate how much water will fit on their penny. Perfect experiment that fits with science as well as with math.
Then they take their dropper, fill it up with water, and keep dropping the water slowly on the penny. Count the drops. Who was the closest? Do you have more kids? You can see who was the furthest or the next closest. Write it down and compare.