(2) Zero is an even number.

(3) Useful skills of percentage.

Do you know that x% of y is equal to y% of x?

This makes it much easier to calculate the percentage. For example, try to figure out 8% of 50 in your mind. It is not easy. It is obviously easier to calculate 50% of 8 in reverse now.

Similarly, 32% of 75 may seem difficult to calculate, but 75% of 32 seems easier to calculate.

(4) When writing in English, every odd number contains an "e".

(5)? "4" is a unique number. When written in English, its spelling contains the same number of letters as the number itself.

(6)? If you play 13 different playing cards (A (trump card), 2 (2), 3 (3), 4 (4), 5 (5), 6 (6), 7 (7), 8 (8), 9 (9), 65438+.

(7) When writing in English, the only number spelled alphabetically is "forty". The only number spelled in reverse alphabetical order is "1 (1)".

You can cut a cake into eight pieces with only three knives.

In the past, many companies used this question as an interview question to test "divergent thinking", but now it has been overused, and everyone knows it.