Metric System Clever Catch provides an excellent way for children to learn the names of the states in the U.S., their capitols, their motto, and something about each state. There are 66 facts included. Clever Catch can be used at school in organized classroom activities. It can also be used on the playground or at home. For grades 6-9. A new addition to our ever expanding educational line called Clever Catch Balls. Example questions found on this ball are: Which of the following is NOT a metric unit for temperature? A. Celsius, B. Fahrenheit, C. Kelvin. 2.54 cm =____ inch. Name the SI base unit of time.