Conversion Sixteen pennies, stacked, is one inch. Large number of pennies (Photo credit: Wikipedia) Supplies As many pennies as you can find A one-foot ruler A three-foot yardstick Pencil Doorjamb Paper Instructions Count out 16 pennies Stack the pennies Measure the stack. It should be one inch tall. Measure how tall each grandchild is, first using a ruler, then using a yardstick, drawing a line next to the top of their head on the nearest doorjamb Calculate and write down how tall they are in inches by adding 12 inches for each foot in the ruler, or 36 inches for the three-foot yardstick, plus... (Read More ...)