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Casio FX-991DE Plus vs Casio FX-991DE X

    3.15 in
    6.38 in
    Casio FX-991DE Plus Calculator
    Casio FX-991DE Plus
      3.03 in
      0.44 in
      Casio FX-991DE X Calculator
      Casio FX-991DE X
      Available colors
      User rating
      59
      4.0 out of 5
      59 user ratings
      5 stars
      		37 %
      4 stars
      		32 %
      3 stars
      		25 %
      2 stars
      		5 %
      1 stars
      		0 %
      65
      3.6 out of 5
      65 user ratings
      5 stars
      		24 %
      4 stars
      		30 %
      3 stars
      		30 %
      2 stars
      		9 %
      1 stars
      		4 %

      Full Comparison

      Units:

      Technical details

      Casio FX-991DE PlusCasio FX-991DE Plus
      Casio FX-991DE XCasio FX-991DE X
      TypeScientific calculatorScientific calculator

      Design

      Casio FX-991DE PlusCasio FX-991DE Plus
      Casio FX-991DE XCasio FX-991DE X
      Colour of product
      • Grey
      • Silver
      		Black
      Control typeButtonsButtons
      Form factorPocketPocket
      Coveryesyes

      Dimensions

      Casio FX-991DE PlusCasio FX-991DE Plus
      Casio FX-991DE XCasio FX-991DE X
      Width3.15 in3.03 in
      Height6.38 in0.44 in
      Depth0.44 in6.52 in
      Weight3.35 oz3.17 oz

      Display

      Casio FX-991DE PlusCasio FX-991DE Plus
      Casio FX-991DE XCasio FX-991DE X
      Display typeDot-matrixLCD
      Display tiltingnono
      Second displaynono
      Display lightyesno

      Power

      Casio FX-991DE PlusCasio FX-991DE Plus
      Casio FX-991DE XCasio FX-991DE X
      Power source
      • Solar
      • Battery
      • Solar
      • Battery
      Battery operatedyesyes
      Number of batteries required11
      External power connectionSolar cell
      • External source
      • Solar cell

      Pros & Cons

      Pros
          Cons

              Often compared with Casio FX-991DE Plus

              Casio FX-991DE Plus Calculator
              Casio FX-991DE X
              CasioFX-991DE Plus
              CasioFX-991DE X

              Often compared with Casio FX-991DE X

              Casio FX-991DE X Calculator
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              CasioFX-991DE X
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              Casio FX-991DE X Calculator
              Casio FX-991DE Plus
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              CasioFX-991DE Plus