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| ==Answers to the Abacus Worksheet== | | == Abacus/Worksheet/Answersheet == |
| Ways to make 1/2 just using one string
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| [[File:Abacus1of2.jpg]][[File:Abacus2of4.jpg]] [[File:Abacus3of6.jpg]] [[File:Abacus4of8.jpg]] [[File:Abacus5of10.jpg]] [[File:Abacus6of12.jpg]]
| | Read at https://help.sugarlabs.org/abacus_worksheet_answers.html |
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| To make 1/2 just using one string, the fraction denominator must be divisible by 2. The string must contain an even number of beads, 2 4 6 8 10 12
| | The source file has been moved to [https://github.com/godiard/help-activity/blob/master/source/abacus_worksheet_answers.rst GitHub] |
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| Ways to make 1/2 with more than one string
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| 1/3 + 1/6
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| 1/3 + 2/12
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| 1/4 + 1/6 + 1/12
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| 1/4 + 2/8
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| 1/4 + 3/12
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| 3/9 + 2/12
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| 2/8 + 3/12
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| 1/6 + 4/12
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| 1/6 + 3/9
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| 1/6 + 2/8 + 1/12
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| 2/6 + 2/12
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| 1/5 + 3/10
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| 2/5 + 1/10
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| Is this all of the possibilities?
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| See [http://en.wikipedia.org/wiki/Diophantine_equation Diophantine equations], computer programs [http://tonyforster.blogspot.com/2010/09/turtle-diophantine.html including ones written in TurtleArt] can find all the solutions by trial and error.
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