QUICK ADDITION

Sometimes, standing at the cash register of the store, you catch yourself thinking that you can't easily calculate the cost of your purchase. When the cashier reads the sentence, and frantically begin to add numbers in his mind, trying to understand, whether correctly calculated the amount, I was right there by the cashier. You can certainly use a calculator in a mobile phone or a separate counting device, but I doubt that many carry with them such, and do not want to burden the expectation of store employees and buyers in the queue. But the cashiers, not often, but wrong! Agree that you should not lose your money in such cases. That's why, just need to know how to count numbers, namely folding. This flash game is just a counting machine. You are invited for some specified program time, to select numbers on the game table, the amount of which is set by the computer and displayed on the screen. The game perfectly trains the speed of the addition of primes. For the correctness of the answers and the speed of Your computing points. You can compete with colleagues or perhaps with the family and find out who is better and faster believes. In addition, for students it is also a wonderful way to pull in basic mathematics.