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You can try this funny trick on your friend.
Tell your friend a number and ask him to give you at once the correct next higher number. Then tell him that he may not always be able to do it.
Begin with an easy number, like 49, to which he will answer “Fifty”. Then say “99”. He will say “A hundred”. Then give him “Nine thousand and ninety-nine (9,099)”. It is almost certain that he will answer “Ten thousand”.
In a moment he will understand that the correct answer is “Nine thousand one hundred (9,100)”, of course.