Puzzles from the Math Midway
Number Trivia
1. How many different
positions are there for a Rubik's cube?
A.
About 37 million
B.
About 15 trillion
C.
About 43 quintillion
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Answer: C
2. About how many
different possible poker hands are there?
A.
About two and a half million
B.
About three and a third billion
C.
About four and a quarter trillion
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Answer: A
3. What is 11,111,111 squared?
A.
1,111,111,111,111,111
B.
22,222,222
C. 123,456,787,654,321
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Answer: C
4. Which of the following
unusual properties does the number 2520 have?
A. It
is both a perfect square and a perfect cube.
B.
Every counting number from 1 to 10 divides into it with no remainder.
C. It
is the number of sides of a four-dimensional hypercube.
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Answer: B
5. If you had $10 billion
in 1-dollar bills and you spent one every second, about how long would
it take you to go broke?
A.
317 months
B.
317 years
C.
317 decades
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Answer: B
6. How many different
ways can you assemble six standard 2x4 lego bricks?
A.
About 100
B.
About 100 thousand
C.
About 100 million
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Answer: C
7.
Which property is true of any prime number
p bigger than 3?
A.
Either
p+1 or
p-1 is divisible by 6 with no
remainder.
B. If
you divide
p into 2 raised to
the power
p, the remainder is
2.
C. It
is one less than the sum of two primes.
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Answer: Trick question. Both A and B are true, and nobody knows the answer to C. It seems to be true - it's part of a famous problem called the Goldbach Conjecture - but nobody knows why, or if the pattern really holds forever.
8. About how many ways
are there to play the first four moves in a game of chess?
A. 64
B.
About 300 billion
C.
About 200 quadrillion
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Answer: B
9. Manhattan Island from
end to end is about how many inches long?
A.
About 10,000
B.
Slightly less than a million
C.
Well more than a million
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Answer: B
10. How many nonnegative
integers are there which are twice the sum of their digits?
A.
Zero - it can't happen!
B. Two
C.
Infinitely many - it happens all the time.
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Answer: B. They are 0 and 18
11. Which of the
following interesting properties applies to the prime number 17?
A. It
is equal to the sum of the digits of its cube.
B. It
is the only prime that is the average of two consecutive Fibonacci
numbers.
C. It
is the smallest prime that is the sum of two different fourth powers.
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Answer: Another trick question - all three properties are true.
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