Good card Magic tricks

What are some good card magic tricks based on simple mathematics?

Well, you don't need entire deck for this strategy. Just 13 cards of a family (the four).
Arrange all 13 cards facing up and ask the spectator(s) to choose a card in his mind's eye (right here every card has its own value involving it, viz. A=1, 2=2...10=10, J=11, Q=12, K=13).
Now ask the spectator to boost the worthiness by 1 each time you knock on the card (irrespective of the value of the card you knock-on) and ask him to avoid you when the count hits 21( As twenty-first knock is the card which he features chosen).
Start knocking arbitrarily for 7 times, 8th knock-on King,
9th on Queen,
tenth on Jack,
11th on 10
and so on(in decreasing order of this values) till the matter in spectator's mind get to 21.

Let's consider an illustration:
Why don't we assume the card picked is 8 (which will be unknown to you personally).
So, the value of the card here is 8.
Today ask the consumer to incorporate 1 (beginning with the bottom price, right here 8) every time you knock the card.
Knock 7 times on arbitrary cards so adding 1 each and every time gives you count 15(base value + 7 hits, in other words. 8+7 =15)
Then you start slamming in lowering order staring from King ergo,
Knock-on K = 16,
Knock on Q = 17,
Knock-on J =18,
Knock-on 10 = 19,
Knock-on 9 = 20,
Knock-on 8 = 21...
While you have actually asked user to get rid of you as his matter reach 21 he can stop you here as well as your knock on that card says the card which user has actually choosed.

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