A very cool activity, and a fun way to practice the order of operations.
The computer randomly chooses 4 digits. Use the four digits and the arithmetic functions - Addition, Subtraction, Multiplication and Division (and also Exponents and Parenthesis) to form the numbers from 1 to 10.
The classic Connect 4 game, but students have to first correctly evaluate the numerical expresson before they are allowed to drop their chip.
A game styled on the British TV show Countdown, where contestants used 6 numbers and the usual operations and brackets to make the target number. This program has a great bonus - after you have found a solution (or not), the program will then list all of the solutions. It can be a rather humbling experience.
You are given 4 cards, the operations +, -, x, / and brackets. Your task is to construct an expression using all 4 cards that evaluates to 24. Oh, and you have to find an answer in less than 1 minute. Initially this task is can be very challenging, but the more problems you try, the easier they become. From Cool Maths.
A multi-page TI-Nspire document on the order of operations. It includes a series of interesting and challenging activities.
The Countdown Game is a great way to review Mental Computation and the Order of Operations. Highly recommended.
Numbers and Letters is a variation of the Countdown Game that has additional controls for classroom use.