Four Fours is a game in which students race to use the four mathematical operations (addition, subtraction, multiplication, and division), exponent, square root, factorial, and order of operations to create mathematical expressions for each of the whole numbers 1 through 100. The challenge is that they must use only the digit four and it must be used exactly four times in each expression.
This activity is highly engaging as students compete to outsmart each other. Once the "easy" expressions