Puzzles

﻿We are all about fun mathematics. Try these two puzzles. Send us your thoughts if you like via an email to navajomath@gmail.com.
Check back for more puzzles!

1. Jim Storer has a remarkable on-line description of many puzzles. His website is Vast Puzzle Website. In case his site is down, check out his big book of puzzles Jim’s Big Puzzle Book
2. Dissection Puzzles
3. Pentominos
4. (From our friend, @jamestanton):The number 21200 is self-describing: it has 2 zeros,1 one, 2 twos, 0 threes, and 0 fours. How many 5-digits numbers almost like this? How many are correct in 4 of the 5 digits?
5. Can you plant exactly seven trees, so that there are exactly six rows, each containing exactly three trees?
6. Is it possible to slice a cube with a straight plane to get a pentagon? Is it possible to slice a cube with a straight plane to get a regular pentagon? Is it possible to slice a cube with a straight plane to get a regular hexagon?
7. The number $$2015!$$ is a really large number. It is equal to $$1 \times 2 \times 3 \times \cdots \times 2014 \times 2015$$ How many zeros does it end with?

We like people to view the material on our website. However, we can’t resist pointing out a couple of nice puzzle sites with many good ones. Check out https://krazydad.com/ and https://braineaser.com/.