At the beginning of summer break, measure all siblings in the family using customary units (feet). Convert to inches. (1 foot = 12 inches.)
The last day of summer break, repeat the process. Find the range to see how much growth occurred over the summer for each child by subtracting the beginning height from the ending height. This can be done with centimeters converting to millimeters as well. One centimeter equals ten millimeters.
EXTENSION: Find objects in and around the house that are about the same length/height as you. Measure the object and compare to you. Record the difference between your height and the object at the beginning of summer break and also at the end of summer break. (Subtraction and estimation skills).