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There are many mathematical riddles like this.

1; One plus one is not two. (Type a word)

Combine the word "one", the plus sign "+"and another word "one" to get the word "Wang" instead of "two". The answer is king.

Two minus one is not zero. (Type a word)

The word "one", minus sign and another word "one" are combined to get the word "three" instead of "zero". The answer is three.

3. Seven eighths. (Type an idiom)

"Eight-sevenths" is written in mathematical symbols, the number 7 is written above the fractional line, and 8 is written below the fractional line. The answer is the idiom "seven ups and eight downs".

In the above riddle, a new understanding of the words in the riddle with some simple mathematical knowledge can help guess the answer.