Math Is Fun Forum
  Discussion about math, puzzles, games and fun.   Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ • π ƒ -¹ ² ³ °

You are not logged in.

#1 2018-07-21 01:07:23

ganesh
Administrator
Registered: 2005-06-28
Posts: 25,639

Math Riddles

Q: Why should you never mention the number 288 in front of anyone?
A: Because it is too gross (2 x 144 - two gross).
* * *
Q: How is the moon like a dollar?
A: They both have 4 quarters.
* * *
Q: How can you add eight 8's to get the number 1,000? (only using addition)
A: 888 +88 +8 +8 +8 = 1,000 .
* * *
Q: What is the smallest three digit palindrome divisible by 18? Can you solve this without a brute force examination of possibilities?
A: 252.
* * *
Q: How many eggs can you put in an empty basket?
A: Only one, after that the basket is not empty.
* * *
Q: Where can you buy a ruler that is 3 feet long?
A: At a yard sale.
* * *
Q: When things go wrong, what can you always count on?
A: Your fingers.
* * *
Q: What coin doubles in value when half is deducted?
A: A half dollar.
* * *
Q: What has 3 feet but no toes?
A: A yard stick.
* * *
Q: Why are diapers like 100 dollar bills?
A: They need to be changed.
* * *
Q: What goes up and never comes down?
A: Your Age.
* * *
Q: Why is the longest human nose on record only 11 inches long?
A: Otherwise it would be a foot.
* * *
Q: Why didn't the quarter roll down the hill with the nickel?
A: Because it had more cents.
* * *


It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi. 

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

#2 2018-07-27 15:20:28

Monox D. I-Fly
Member
From: Indonesia
Registered: 2015-12-02
Posts: 1,252

Re: Math Riddles

ganesh wrote:

Q: What is the smallest three digit palindrome divisible by 18? Can you solve this without a brute force examination of possibilities?
A: 252.

How did you find that without brute force?


Actually I never watch Star Wars and not interested in it anyway, but I choose a Yoda card as my avatar in honor of our great friend bobbym who has passed away. May his adventurous soul rest in peace at heaven.

Offline

#3 2018-07-27 16:16:03

ganesh
Administrator
Registered: 2005-06-28
Posts: 25,639

Re: Math Riddles

Hi Monox D. I-Fly,

Given : The smallest 3 digit number divisible by 18. Therefore, the required number must be an even number; the first 3 digit palindrome number is necessarily even.
Since it is a 3-digit even number and it is a palindrome number, which is divisible by 9, this this the first such number, viz. 252.

Given the conditions, we arrive at 252.


It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi. 

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

#4 2018-07-27 20:12:02

Monox D. I-Fly
Member
From: Indonesia
Registered: 2015-12-02
Posts: 1,252

Re: Math Riddles

Ah, right...


Actually I never watch Star Wars and not interested in it anyway, but I choose a Yoda card as my avatar in honor of our great friend bobbym who has passed away. May his adventurous soul rest in peace at heaven.

Offline

Board footer

Powered by FluxBB