Some have a time limit to complete tasks, much like a game. If the math problems are not completed in time, a buzzer sounds indicating that they are out of time. This raises the competitive level from simply completing tasks to competing for how quickly they can do it, and do it correctly.
Trading is an art. By being aware of your intuition and your feelings, you may find that you are able to trade in unique and different ways. The only way to discover that is by documenting it. The information can be maintained separately or right on the charts that you use to execute trades. The key is to document your emotions, logic, and reasoning for entering and exiting trades. Through the accumulation of 10, 30, or 100 journal entries, you are able to reasonably determine how well you are doing.
Go Shopping! : You can cater this to all different ages. For young children, you can do a 'mock shop' and let them pretend to go shopping in a pretend store (your kitchen). Label certain items with easy to read prices and print some pretend money for them to shop with! For older children, you can let them help you in the actual grocery store with a specific shopping list. You can even set specific spending limits and give a specific amount of items and let them determine what they can afford, etc.
Children naturally love counting and doing puzzles, but for some reason, when you call it "math", all of the interest flies out the window! So how can you cater to this natural love of 'math' and keep it fun and interesting enough to keep children's interest?!