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In some of my classes I put a puzzle up on the board for students to try and solve. This is useful for when they finish an exercise early or if I need time to mark the roll. It can also be a filler if there is time left at the end of the session.
An example of these puzzles is 24 = H in a D
The answer is 24 = Hours in a Day
The first time you use these with your students I recommend you point out that both the number and the phrasing are clues. It is easy enough to make these brain teasers up and and tailor them to your particular subject area.
I have attached a document with a couple of dozen included that you can use in your classroom - download.
There are some culturally specific riddles and some are dependent on experience. For example Americans may find it difficult to get 13 = P in a RLT (13 players in a Rugby League Team) just as Australians will struggle to get 13 = S on the AF (13 stripes on the American Flag). Similarly, if you haven't read 1000 leagues Under the Sea then you won't get 1000 = L under the S.
I can guarantee that some of these will drive your students crazy. A favourite of mine is 200 = D for PG in M. Can you guess the answer?
If you want more documents like this then just type the following search string into the Google search bar - brain teaser filetype:doc Adjust 'brain teaser' and 'doc' to suit your needs.
Enjoy.
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Activities 
