Read the jokes then use the code to try to work out the punch line.
Show your child how to use the grid by placing their fingers on the letter and number and seeing where they meet. This will show them which letter to write on the line e.g. for E1 follow the E and the 1 to the square with the letter a in it.
Download a printable copy below:
Crack the Joke
.pdf
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When they have finished, they could use the code to create their own secret messages.