Substitution for Variables in Expressions - Hockey Theme - Game Tips:

- Get 5 correct answers and see the substitute skater !

- The word 'expression' in Mathematics has a very general meaning.
   An expression can be any mathematical form using symbols.   For example: (y+5)

- The expression (y+5) uses the variable 'y'.
   The variable 'y' is a 'place holder' or symbol representing a member of a set.

- In this game, a variable such as 'y' represents a number from the whole number set.

- The focus of this game is to substitute the number value of a variable, such as y=7
   into an expression containing the variable, such as (y+5)
   in order to evaluate the expression.    In this case it's (7+5) = 12.

- It may take a minute to load the game at dial-up speeds.
- The game can be played using the mouse by itself or using the keyboard by itself.
- If the game doesn't respond to keyboard input, click inside the game area to reset the game's focus.
- The game speeds up as your score increases. Adjust this with the - and + keys.



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