Showing posts with label fx-991EX Classwiz. Show all posts
Showing posts with label fx-991EX Classwiz. Show all posts

Sunday, June 29, 2025

Spotlight: Casio fx-570SP X II Iberia

Spotlight: Casio fx-570SP X II Iberia


Quick Facts



Model: fx-570SP X II Iberia

Company: Casio

Timeline: about 2014 – 2022, predecessor to the fx-570SP CW

Type: Scientific

Power: 1 AAA battery

Memory Registers: 9 (A, B, C, D, E, F, x, y, M).

Language: Castellano, Català, Euskara, Portugués

Number of Functions: 576 (see source)



This calculator is designed for Spain and Portugal market. I recently was able to obtain one from an auction site.












Introduction



Iberia is in reference to the Iberian Peninsula, which contains Spain and Continental Portugal. The fx-570SP X II Iberia is a calculator with all the keys, menus, functions, and prompts in Spanish.



Examples:

The trigonometric functions sin and sin ⁻¹ are labeled sen and Arcsen, respectively.

MCM is Minimo Comune Multiplo, also known as Least Common Multiple (LCM) in a lot of the world.

Likewise, MCD is Maximo Comune Divisor, also known as Greatest Common Divisor (GCD).



The calculator uses a decimal point as a separator between a number’s integer and fractional part.

The fx-570SP X II Iberia is based off the fx-570EX and the solar counterpart, the very popular fx-991EX Classwiz.



My review of the fx-991EX Classwiz from 2015: https://edspi31415.blogspot.com/2015/11/casio-fx-991ex-classwiz-review.html



There are several functions that are present of the fx-570SP X II Iberia that are not present in the fx-991EX Classwiz:



|_ ([ALPHA] [fraction bar template]): Euclidean Division. Returns the quotient, labeled C, and remainder, labeled R, from dividing two integers.

Example:

148 |_ 15 returns C=9, R=13



Π ([ALPHA] [ x ]): Product of a function f(x). In E Mat (Math IO), the product function is shown in a template form.

Example:

1^2/2 * 2^2/2 * 3^2/2 * 4^2/2 = Π(x^2/2, 1, 4) returns 36





MCM ([ALPHA] [ ÷ ]): Least Common Multiple

Example:

LCM(14, 21) → MCM(14, 21) returns 42



MCD ([ALPHA] [ × ]): Greatest Common Divisor

Example:

GCD(14, 21) → MCD(14, 21) returns 7



Simp ([ALPHA] [ ( ]): Manual simplification of fractions (when Simplificar - Manual is selected).



Repeating Bar ([ALPHA] [ √ ]): Allows to easily type repeating decimal patters.

Example:

1/3 can be written as 0.3 with a bar over the 3 (0.3333333333…).



Menu (Menú)



The modes of the available in the fx-570SP X II are same of the fx-991 EX Classwiz:



1: Calcular (Calculate)

2: Complejos (Complex Numbers)

3: Base-N (Base Conversions and Boolean Objects)

4: Matriz (Matrices)

5: Vector (Vector)

6: Estadística (Statistics)

7: Distribución (Distribution)

8: Hoja de cálculo (Spreadsheet – 1,700 byte capacity, 45 rows, 5 columns (A-E))

9: Tabla (Table – up two function f(x), g(x), can be graphed using a QR code)

A: Ecuación/Func (Equation Solver: Linear Systems and Polynomials)

B: Inecuación (Inequalities)

C: Verificar (Verify)



The fx-570SP X II can solve up to 4 x 4 linear systems and 4-degree polynomials.



Regressions included are:

y = a + b x

y = a + b x + c x²

y = a + b ln x

y = a e^(b x)

y = a b^x

y = a x^b

y = a + b/x



The fx-570SP X II is succeed by the fx-570SP CW (https://www.calculados.com/calculadoras/fx-570-sp-cw/#1683017979230-21cc574f-5c0e).



Final Thoughts



I am fluent in English (my first language) and speak some Spanish, so the fx-570SP X II is going to help practice mathematical terms in Spanish. I look forward to using this calculator.



Calculated Industries has a Spanish version of the Construction Master 5 named the Construction Master 5 En Espanol (https://www.calculated.com/prd201/Construction-Master-5-In-Spanish.html), I may want this for my collection.



Source


Casio. “Classwiz fx-570SP X II Iberia” 2024. https://www.edu-casio.es/portfolio-item/fx-570spx-iberia-ii-classwiz/ Retrieved June 3, 2025.



Eddie


All original content copyright, © 2011-2025. Edward Shore. Unauthorized use and/or unauthorized distribution for commercial purposes without express and written permission from the author is strictly prohibited. This blog entry may be distributed for noncommercial purposes, provided that full credit is given to the author.

Sunday, July 5, 2020

Casio fx-991EX and fx-115ES Plus: Velocity Conversions

Casio fx-991EX and fx-115ES Plus: Velocity Conversions

The Casio fx-991EX Classwiz and Casio fx-115ES Plus calculators, among others, have 40 conversions in various areas. 

Keystrokes

Keystrokes: Casio fx-115ES Plus

[ SHIFT ] [ 8 ], enter the required two digit code

The conversions we'll be working with this blog entry:

ft → m, 03
m → ft, 04
yd → m, 05
m → yd, 06
mile → km, 07
km → mile, 08
km/hr → m/s, 19
m/s → km/hr, 20

Keystrokes:  Casio fx-991EX Classwiz

[ SHIFT ] [ 8 ].    The conversions will be grouped by category (length, area, volume, etc).

ft → m, 1, 3
m → ft, 1, 4
yd → m, 1,5
m → yd, 1,6
mile → km, 1, 7
km → mile, 1, 8
km/hr → m/s, ↓, 1, 1
m/s → km/hr, ↓, 1, 2

km/hr  (kilometers per hour) vs mph (miles per hour)

The calculators mentioned does not have a direct conversion between km/hr and mph.  However, because the time frame is the same (per hour), we can use the km/mile conversions (since 1 hour = 1 hour and no time conversion part is required, only the length).

Example 1:  150 km/hr to mph

150 km>mile returns 93.20567884

150 km/hr = 9320567884 mph

Example 2:  65 mph to km/hr

65 mile>km = 104.60736

65 mph = 104.60736 km/hr

More Examples

Example 3:  5.8 ft/s to m/s

Again, since the time portion is the same (second to second), we only have to worry about length.

5.8 ft>m returns 1.76784

5.8 ft/s = 1.76784 m/s

Example 4:  110 ft/s to km/hr

Now we are converting both length and time.   There are no direct time conversions on the calculators featured, so we have to use the manual conversion. 

Remember that 1 hr = 3600 s and 1 km = 1000 m. To convert from m to km, divide by 1000 and to convert from 1/s to 1/hr, multiply by 3600 (note: 1/s to 1/hr)

(110 ft>m) ÷ 1000 × 3600 returns 120.7008

110 ft/s = 120.7008 km/hr

Example 5:  40 m/s to km/hr

Here is another example where we both have to convert the length (m to km) and time component (1/s to 1/hr).   This is similar to the Example 3.  However, the Casio calculators featured on this blog has conversions between m/s and km/hr (velocity section).

40 m/s>kh/hr returns 144 km/hr

40 m/s = 144 km/hr

Example 6:  100 ft^2 to m^2

The calculators have two area conversions (acre/m^2).   However, we can use the same length conversion twice to make other areas.

100 ft>m ft>m returns 9.290304

100 ft^2 = 9.290304 m^2

Example 7:  1 mi to yd by using the conversions available

(1 mi>km × 1000) m>yd returned 1760

(1 km = 1000 m)

1 mi = 1760 yd

A Cautionary Tale

Example 8:  1 acre to ft^2

1 acre>m^2 m>ft m>ft returns 43559.99545

However, as defined, 1 acre = 43560 ft^2. 

Lesson:  use caution when chaining conversions, 100% accuracy isn't guaranteed.

Eddie

All original content copyright, © 2011-2020.  Edward Shore.   Unauthorized use and/or unauthorized distribution for commercial purposes without express and written permission from the author is strictly prohibited.  This blog entry may be distributed for noncommercial purposes, provided that full credit is given to the author

Saturday, May 11, 2019

Casio Calculators and the Percent Key

Casio Calculators and the Percent Key

Introduction

The percent function on Casio calculators varies based on the calculator itself.  Let's compare six key algorithms on six Casio calculators, five current and one from the past.  We will go from the most consistent behavior to the least.

The calculators used in this study are:

SL-300VC  (four function calculator)
fx-260 Solar II  (scientific calculator - one line display)
fx-300MS 2nd Edition (scientific calculator - one line display)
fx-115ES Plus  (scientific calculator - textbook display)
fx-991EX Classwiz (scientific calculator - textbook display)
fx-115D  (scientific calculator introduced in 1991 - one line display)

Let A and B be real numbers.  In the following examples, required press of the [SHIFT] key are implied as required. 

Algorithm 1:  Multiply

Keystrokes:  A [ × ] B [ % ]

Let A = 82, B = 30

SL-300VC:  24.6 
fx-260 Solar II:  24.6
fx-300MS 2nd Edition:  24.6
fx-115ES Plus**:  123/5 ([ S<>D] 24.6) 
fx-991EX Classwiz**:  123/5  ( [ S<>D] 24.6)
fx-115D:  24.6

A [ × ] B  [ % ] calculates A * B/100.  No surprise that the results will be consistent across the board. 

**Pressing equals ( [ = ] ) is required to complete calculations involving percent calculations for the calculators with textbook display. 

Algorithm 2:  Division

Keystrokes:  A [ ÷ ] B [ % ]

Let A = 82, B = 30

SL-300VC:  273.33333 
fx-260 Solar II:  273.3333333
fx-300MS 2nd Edition:  273.3333333
fx-115ES Plus:  820/3 ([S <> D] 273.3333333) 
fx-991EX Classwiz:  820/3 ([S <> D] 273.3333333)
fx-115D: 273.3333333

A [ ÷ ] B calculates A  * 100/B.   Results are consistent across the board.

Algorithm 3:  Adding Percents

Keystrokes:  A [ × ] B [ % ] [ + ]  

A = 57, B = 11

SL-300VC: 63.27 
fx-260 Solar II: 63.27
fx-300MS 2nd Edition:  63.27
fx-115D:  63.27 

This calculates A * (1 + B/100)

If you tried the exact algorithm with the textbook style calculators like the fx-115ES Plus and the fx-991EX Classwiz, you get an error.  Use the following instead:   A [ (  ] 1 [ +  ] B [ % ] [  ) ] [ = ]

Algorithm 4:  Subtracting Percents

Keystrokes:  A [ - ] B [ % ] [ + ] 

A = 57, B = 11

SL-300VC: 50.73
fx-260 Solar II: 50.73
fx-300MS 2nd Edition:  50.73
fx-115D:  50.73 

This calculates A * (1 - B/100)

If you tried the exact algorithm with the textbook style calculators like the fx-115ES Plus and the fx-991EX Classwiz, you get an error.  Use the following keystroke algorithm instead:   A [ (  ] 1 [ -  ] B [ % ] [  ) ] [ = ]

Algorithm 5:  A - B%

Keystrokes:  A [ - ] B [ % ]

SL-300VC: 12.5 
fx-260 Solar II: 12.5
fx-300MS 2nd Edition: 12.5
fx-115ES Plus:  1784/25 ( [S<>D] 71.36) 
fx-991EX Classwiz:  1784/25 ( [S<>D] 71.36) 
fx-115D: 12.5

We see some difference on how this algorithm is calculated and it depends on the type of calculator used.

For four-function basic calculators and one-line scientific calculators, A - B% calculates the percent change:  (A - B)/B * 100

For the  textbook display calculators, the B is merely divided by 100 and subtracted from A:  A - B/100

Algorithm 6:  A + B%

Keystrokes:  A [ + ] B [ % ]

SL-300VC: 200
fx-260 Solar II: 300
fx-300MS 2nd Edition: 300
fx-115ES Plus:  201/2 ( [S<>D] 100.5) 
fx-991EX Classwiz:  201/2 ( [S<>D] 100.5) 
fx-115D: 300

This is the most inconsistent.  Quite honestly, I don't recommend this algorithm. 

What I learned:

1.  Check your manual on how to use the percent function ( % ), not matter what calculator you use. 

2.  Calculators with textbook display, the percent function ( % ) merely divides the argument by 100.

3.  This is an sample of six calculators, and as you can see, your mileage may vary. 

Have fun calculating,

Eddie

All original content copyright, © 2011-2019.  Edward Shore.   Unauthorized use and/or unauthorized distribution for commercial purposes without express and written permission from the author is strictly prohibited.  This blog entry may be distributed for noncommercial purposes, provided that full credit is given to the author.

Saturday, March 24, 2018

Favorite Solar Calculators – Six Years Later


Favorite Solar Calculators – Six Years Later

Favorite Solar Calculators – Reading that Blog Entry Today

On June 10, 2012, I listed some of my favorite solar calculators of all time: 

I still love the TI-25X Solar, I wish the screens weren’t so damn fragile!  I went through two of them. 

I have two fx-115 ES Plus calculators, one gray and one black.  The black looks much better!

Maybe one day I’ll get the BA 35 Solar again from eBay.  Maybe I will give the Casio FC-200V a second shot. 

As of March 2018, Casio fx-3650pII is the current edition of the fx-3650P.  The fx-3650PII is in the shape of the fx-115ES/991ES/300ES/82ES Plus.  That’s about it from what I can get from research:  still four program areas with 360 steps and 7 variables.


No, Casio still currently sells the fx-3650PII only outside the United States, which means for us Americans, we have to order online.  An open invite to Casio to stock the office stores and university stores with this model in the States is extended. 

The current Sharp EL-W516 edition, the EL-516WT, eliminated the formula storage, eliminated the catalog, and reduced the definable keys from 4 to 3, I am not happy about that.




Three More Inductees

I have three more to add to the list I posted in 2012:




Casio fx-991EX Classwiz – 2015 – Present

The Classwiz model is the next step in Casio solar powered calculators.  They have an icon menu, like their graphing calculators, and there is an [OPTN] key that allows users to specific mode-specific functions.  Modes includes computation (COMP), complex numbers (arithmetic, polar/rectangular conversions), base integers, matrices up to 4 x 4, vectors, statistics, distributions, basic spreadsheets up to 5 x 45, equation solving, inequalities and ratios.  The newest feature is the QR function that will take a screen shot of the calculator, or in some cases, statistical graphs, which can be retrieved from the Casio QR Website or app.


I can only hope the next iteration the Classwiz and the fx-3650P or fx-50FII merge so programming will be included.



TI-30 SLR+ – 1987 – 1990s

This is a bigger version of the TI-25X Solar (TI-30X Solar internationality).  This calculator completely runs on solar and light power.  What I look about this better than the TI-25X are the keys and the fact the display isn’t so fragile.  See my detailed blog of it here:  https://edspi31415.blogspot.com/2014/09/ti-30-slr-and-memories-of-school.html




Casio fx-260 Solar II (we can included the Casio fx-260 Solar, fx-82 Solar, fx- 82 Solar II)
Original fx-260 Solar/fx-82 Solar:  2000s – present
Current fx-260 Solar II/fx-82 Solar II: 2017 – present

I don’t know what I was thinking when I skipped this model last time.  The fx-260 offers a wide variety of functions:  trigonometry, logarithms, fractions, degrees and degrees-minute-second conversions, polar/rectangular conversions, and one variable statistics.  This is great calculator for those who want a small, compact, calculator that attacks the basics.  The fx-260 series is completely solar powered.  Pictured is the newer fx-260 Solar II, which the mode markers have been mode to the back of the calculator case.  Can’t beat the classics. 



Eddie

This blog is property of Edward Shore, 2018.

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