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It’s kind of a teaching tool in which you need to fill the blank field first to decide how many seconds number should stay on the screen and how many numbers will be shown and what could be the maximum/minimum number to show. Kids will have to keep the number in mind what they see on the screen and then need to add with the number they see on the screen next and keep doing it until they are asked to type what they have got after adding all the numbers. Type the number and submit to check whether you have got it wrong or right.