Do not get pissed knowing how useless (but pretty important) the facts are-
- If you write out pi’s value up to 2 decimal places, backwards it spells ‘PIE’
2. The Birthday problem- In a room of 75 people , there is 99% probability that two people have the same birthday.
3. Zero cannot be expressed in Roman Numerals

4. (111111111) * (111111111) = 12345678987654321
5. (6 × 9) + (6 + 9) = 69 (this number is worth the hype XD)

6. We tend to think of men as odd numbers and women as even number. . Even Pythagoras thought that numbers posse genders

(tested by James Wilkie and Galen Bodenhausen of Northwestern University)
7. 4 is considered very unlucky number in Asian countries. In South Korea, lifts sometimes skip 4th floor button or sometimes indicate it as ‘F’.

8. 10! seconds exactly equals 6 weeks.
9. 555 is used in Thailand as a slang for ‘hahaha’ as ‘five’ is pronounced as ‘ha’ in Thai.
Credits-
23 Fascinating Maths Facts You'll Probably Never Need To Use