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fractions: add 2 activities

Johnny Jazeix requested to merge work/fractions_charts into master

First activity is to select the good number of parts on a chart to have the asked number. create_fractions

Second activity is to find a fraction from a chart (either selected items on a pie chart or a rectangle). find_fractions

The MR is to discuss about the datasets content and the different pedagogical texts. Graphical update will be done once merged.

To be discussed:

  • we can set the start angle of the split of the pie (so horizontal instead of vertical, 45°...). Is it interesting?
  • I haven't added randomized dataset, it could be interesting. Also, having sublevels per categories to avoid having 40 levels could help?
  • The fraction displayed in the Create fractions may not be useful (or have it like a hint instead)?
Edited by Johnny Jazeix

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