Hobbies And Interests
Timer
Any game will need to include some form of timer. In "Speed Math," the timer is a countdown clock that stops the game when it reaches zero. In "Grand Prix Multiplication" and "Drag Race Division," you are set you up as a driver in a race, so the timer is slightly more conceptual, and you can compare your time to the time it takes your opponent to cross the finish line.
Accuracy
In a lot of electronic education games, the game has an inherent punishment for wrong answers. Many speed games replace this with an accuracy mechanic, such as"Speed Math" which presents a player's percentage of correct answers at the end of a round. It isn't as much about getting the questions right or wrong, but about how many you can answer and how quickly. This means there is no penalty for wrong answers, and instead of losing the game, you will simply find out how accurate you were. In "Ultimate Speed Math" you get a certificate of achievement with the number and your time.
Story
For some of the games--"Division Derby" and "Space Race Multiplication," for example--the game has something like a plot. You may be a horse jockey or an alien, both trying to beat your opponents across a finish line.
However, other games may be light on story, or not have one at all. "Ultimate Speed Math" simply presents you with questions and challenges you to answer them quickly. The games with a story may appeal more to younger kids, while older kids may not care as much and simply enjoy the challenge of the problems.
Subject Matter
Addition, subtraction, multiplication and division are each slightly more complicated than the previous, and players of these games may not be expert with all of the types of problems. There are games that focus on just one of these types of math, while others which mix them up. "Penguin Jump Multiplication," as the title suggests, focuses on multiplication, while "Speed Math" can be made to focus on pure addition, or a mixture of addition, subtraction and multiplication.