Step 2: The Rules

  • Except as noted, game play is similar to normal Scrabble
  • On each turn, players must make or add to a valid and correct equation.
  • Players keep 9 tiles in their hand at all times, not 7 as in normal Scrabble
  • Players form valid equations rather than words.
    • example: '3+3=6'
  • You can add to an existing equation on one side or both sides in a single turn.
    • example: you can add to both ends of '3+3=6' in a single turn to make '63+3=66'
  • You may only use one new '=' sign per turn
  • Order of operation:  The game will function correctly as long as you agree beforehand on the order of operation.  You can play with either "standard math" (ie, multiply preceeds plus unrelated to the written order), or  "strict left-to-right evaluation".
    • Square and Square-root operators apply only to the immediately preceding or following number
    • There is no implied multiplication
  • Equations can have multiple equal parts.
    • example: '2x2=1+3=4=5-1'
  • Redundant equations are valid
    • example: '1-1+1-1=0=0+0'
  • The '-' may be used either as an operator or before a number indicate its sign.
    • example: '-3=5-8'
    • example: '3=-5--8'
  • You may not use leading '+' signs or leading '0' in front of a number
  • You may not string together arbitrary symbols
    • example: '3+xx4==12' is NOT valid.
  • In normal scrabble, you can place one word alongside another if they create a valid cross-word.  Here, a 2-character sequence can never be an equation so this generally is not possible.  As an optional rule, you may choose to allow placing alongside when only numbers are formed as the cross-words, but you still need to connect to an existing equation some other way.
  • As an optional rule, you may choose to disallow the following "Identity" equation fragments:
    • "x1"   example:  you could not turn '3+4=7' to '3+4=7x1'
    • "+0" and "-0".   example:  you could not turn '3+4=7' to '3+4=7+0'
    • I recommend allowing these when playing in a learning scenario, but disallowing them with experienced players as you get into tedious '2+2=4+0+0+0x1x1' situations.
<p>Great idea for a game. There is a similar ' number scrabble ' game. It is called ' Smath ' ! </p><p>http://www.kingarthurstoys.com/pressman+5200-06+smath+game</p>
<p>Math scrabble? Cool..</p>
<p>Definitely would be great to add parenthesis and variables. Don&rsquo;t know how that would work, but it be great to take the game from arithmetic to more advanced mathematics.</p>
How about adding parentheses for longer expressions? <br>
Wow: the perfect game for me! And for the ultra-nerdy; use binary or hexadecimal?
My head was spinning checking out your game calculations...i need this game for my 9yr old who doesn't want to use her head for maths and so this might help ...i'm praying...thanks
I remember wishing that there was a scrabble for math geeks, but now I can stop wishing and start making!
Cool!<br /> Is there any where to buy blank tiles?
Sometimes antique malls have big bowls of Scrabble tiles available on the cheap.
Thanks for this.&nbsp; I just finished making this game as a gift for my Mom's birthday.&nbsp; Her and my brother are word/number game freaks.&nbsp; They are going to love it.<br /> <br /> I bought a new game and marked the back of the tiles.&nbsp; I used a regular sharpy for the main numbers and operators.&nbsp; Then I used a fine tip sharpy to mark the value numbers in the lower right.<br /> <br /> I finished it off with a couple layers of clear coat just so the numbers don't wear out.<br /> <br /> Many Thanks,<br /> Kaspr<br />
I LOVE&nbsp;THIS!&nbsp;I'm a really bad speller, so I have always hated playing scrabble, but I&nbsp;love math. This is great. Thank you!<br />
What next - Boolean with TRUE / FALSE tiles..? <br /> <br /> L<br /> <br />

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Bio: Dan Goldwater is a co-founder of Instructables. Currently he operates MonkeyLectric where he develops revolutionary bike lighting products. He also writes a DIY column for ... More »
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