For example, if you pick to count forward by 3, the app gives you 3 as the first number, 36 as the twelfth number, and you need to fill in 6, 9, 12, etc.
When you are done, the app tells you how many you answered right the first time and the average number of seconds per answer.
When done, the app tells you how many you answered right the first time and the average number of seconds per problem.
The app gives you the first and twelfth number and you need to fill in the rest.
The app randomly selects a Fact Family based on your settings and presents all problems in the family.