Common mathematical riddles include:

1. One plus one is not two. (Type a word) The answer is Wang.

2. One minus one is not zero. (Type) The answer is three.

3. Seven eighths. The answer is the idiom "seven ups and eight downs".

4. Seven six five four three two one. The answer is "reciprocity".

You expect me, and I expect you. (A mathematical noun) Two people waiting for each other can be described as "equal". The answer is the same.

6. What's the score? The answer is two mathematical terms: fraction and geometry.

7. No one is exactly left behind (hit the math noun 1).

8. Addition of growth pattern (mathematical term 1)

8. boarding instructions (type mathematical terms) multiplication

9. Cheating in the exam (playing math nouns 1) false scores

10. 1, 2,5 Type an idiom (forgetting things)

1 1.00000 Type an idiom (foolproof).

12.2468 1 idiom (coincidence)