Record this target number.
Players take turns.
Finds the square of the estimate with the calculator and records it. The first player who makes an estimate whose square is within 0.1 of the target number wins the game. For example, if the target number is 139, the square of the estimate must be greater than 138.9 and less than 139.1. This key provides the best estimate of a square root that the calculator can calculate. 11.79 139.0041 less than 139.1 Player 2 wins.