# Tag Archives: puzzle

## What is Multiplication – part X

Yesterday, in the supermarket, a customer dumped a whole basket full of power bars on the counter.  The checkout counter person started to scan them in, one by one.  After seeing about seven of them scanned, with a lot more … Continue reading

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## Math in the Comics – part 10

From last week’s Foxtrot comic, another take at the cultural background conversation of math. Who is bad at math? At one level, a puzzle.  The top part, the part that starts with “16-11-13-5” is not a subtraction problem.  It is … Continue reading

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## A Collatz-Inspired Puzzle

This is a puzzle. In prior posts, I used the Collatz Problem, restated here: Each counting number n past 1 is assigned a successor number, as follows: The number “1″ is considered home, and when you’re home, you stop.  If … Continue reading

## Mathematical Puzzle – Hinges

This is a puzzle. Imagine I have three rods of length 1 each, and they are connected together with perfect hinges.  Together, they form a somewhat flexible shape ABCD (with AB=1, BC=1 and CD=1), even if I fix the two … Continue reading

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## Math in the Comics – part 2

Today, Bill Amend has another comic strip with math in it: It plays on the Fibonacci series, which these two geeks obviously know well.  The starting numbers of the Fibonacci series are 1, 1, 2, 3, 5, 8, … and … Continue reading

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## Notes on Divisibility – Common Divisors

In an earlier post I introduced the notion of a divisor without relying on division, instead thinking of it as a mark that was left during skip counting. This is a very old notion, dating at least to the times … Continue reading