Source: math.kujo.app

Create math facts flashcards for my kids. Allow the user to select the math operation and the number(s) that they want the math facts to be about. They can choose more than one number. The math problem should appear in the form of a math flash card and then to answer, there will be a number keypad look. As soon as they select the right number it quickly displays the next problem. The numbers in the math problem should never be larger than the number 12. Keep a running tally in the bottom corner to keep track of how many they have answered. If they type the wrong answer, don't let them select that number and wait for them to pick the right number. Any problems they get wrong, surface that problem again sooner to help the kids master it.

Only go up to 9 on the keypad. If the answer is more than 9 the user should click multiple buttons. Also, don't disable the buttons or turn them red.