Group Activity Cards
groups of 2.
Materials: Clock or watch
You know that a prime number is a whole number greater than 1 that has exactly two factors--itself and 1. An emirp ("prime" spelled backwards) is a prime number that turns into another prime number when the digits are reversed. For example, 13 and 31 are emirps.
Agree with your partner on a time limit such as 5 or 10 minutes. Which partner can find the most emirps in the allotted amount of time?