Question about Casio DR-T220 Calculator

2 Answers

There is no "plus equal" key!

My work book tells me to use the "plus equal" key for certin equations...problem is...there isn't one! im using a casio there another way to get the same effect as the "plus equal button? and if

Posted by on

  • stellap Sep 17, 2008

    The problem in the book reads:

    enter 500

    (divide key)

    enter 1428

    (plus equal key)

    ***at this point the answer reads: .350***

    enter 127

    (plus equal key)

    ***the answer key reads .089***

    what im still stuck on is how do i input a number on the DR-T220 so that the calculator continusley subtracts from 1428. the book shows that the "plus equal key" does this action for those who are fortunate to have one.



2 Answers

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.


    An expert that has over 500 points.

  • Expert
  • 305 Answers

Press the plus key again, it should work. ie put a number in and press the plus key twice, it should double, and again it should double again and so on

Posted on Sep 17, 2008

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 1 Answer

After add some numbers or minus equal key not show result or not working only show multiple or divide

Posted on Nov 16, 2008


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya Technician can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repair professionals here in the US.
click here to Talk to a Technician (only for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

How to find the equal sign to use with variables for the fx-300ES PLUS"?

There is none. For the TABLE feature the calculator will display the = sign. f(X)=.... For solving an equation (or equations) the right sides are assumed to be 0, so, you do not need the sign.

May 29, 2014 | Casio Office Equipment & Supplies

1 Answer

How can i write this in my calculator example. 2x=10 the answer is x=5 but how can i put x in the calculator

What you want to do is solve the linear equation 2x=10 to find the value of the unknown x that makes the equality true. Solving an equation usually involves rearranging therms, factors and so on. However your calculator was not designed to handle the solution of equations, no matter how simple they are.
Some Casio scientific calculators can solve some types of equations (polynomials of degree 2 or 3, simultaneous linear equations in up to 3 unknowns). These are the FX-115 ES (Plus) and FX-991 ES (Plus C). Other equivalent models are sold in the world under different names.

Oct 16, 2013 | Casio FX350MS Scientific Calculator

1 Answer

Casio ds120tv

The equal sign is in fact a command to tell the calculator to start calculating. It cannot be used independently, out of this context. Newer scientific calculators that have equation solving capabilities may have a second equal sign used to write equations.
See if you have an additional = accessed by pressing an ALPHA key first.

Sep 30, 2013 | Office Equipment & Supplies

1 Answer

How do i calculate my rational equations using my casio fx-115es for example x/8=8/x

You do not need a calculator for this proportion.
For a proportion a/b=c/d, the product of the extrems (a*d) is equal to the product of the means (b*c).
In your case x*x=8*8 or x^2=64.
The two solutions are x=+square root (64) or x=-square root(64).

For a less trivial equation, you can use the solve feature of the FX-119ES. To do so, use the ALPHA keyboard to enter your equation; once the equation is typed in, do not press the main equal sign, but the Solve key (the key is located near the top left corner of the keyboard). You will be prompted to solve for X?.

Feb 24, 2012 | Casio FX-115ES Scientific Calculator

1 Answer

How do you enter the following equation on a Casio fx-300es calculator: X - 17 = 34

The calculator does not have an equation SOLVER. But to solve this equation or any linear equation you need no calculator. Use the properties of equalities to isolate the unknown.
X-17+17=34+17 (Adding the same number to both sides of an equality does not break the balance).
Since -17+17=0 and 34+17=51
You get X=51

Aug 21, 2011 | Casio fx-300ES Calculator

1 Answer

How can i write an exquation and solve for X on my casio fx-7400G plus

You can not do that like you think you could. You have to enter your y= equation in to the graph and then look at the graph line to see what X equals at a certain Y. Or you can rearrange the equation. For example: y=4x+5, rearrange it to be (y-5)/4 then plug your Y-value in and it will give you the X-value.

Aug 12, 2011 | Casio FX-7400G Plus Calculator

2 Answers

Im trying to graph a parametric equation and whenever the equation has an exponent/power in it the calculator says Syn error so i know how to graph x=2 cos T, y=2 sin T and similar equations without a...

To enter powers of trigonometric functions you must enclose the functions in parentheses and then apply the exponent to the whole. For example X1t =(sin T)^3 , Y1t=(cos T)^3 will give you a shape similar to a rhombus with concave sides. The symbol ^syands for the operation of raising to a power. The key is the one with the caret symbol ^ , and it is wedged between the xsqure and EXIT keys (third row of keys).
As regards the cotangent, use the equivalent definition cot(X)=1/tan(X).

Jul 26, 2011 | Casio FX-9750GPlus Calculator

1 Answer

How do i use the equal sign when solving an equation?

You enter the problem into the calculator and when you are finished you press the equals sign to make it give you the answer to your problem.

Here is an example;

If I wanted to know what the sum (or total) was for 2 + 10+ 16 - I would enter the number 2 and then the plus sign + and then the number ten and the plus sign + and then the number sixteen and the plus sign again + and then press the equals sign which looks like this =. when I press the equals sign = the calculator gives me the answer to my question of what the total of those numbers are.

I hope this helps?

Jul 16, 2011 | Casio fx-300ES Calculator

1 Answer

Casio fx-7400G PLUS cubic solver?

First let us repair the terminology.

  1. You can evaluate any expression (find the value of any expression for a particular value of its variable).Store a value in the variable, say X. Key in the expression and press [EXE].
  2. You can consider your expression(should not contain a relational operator such as =, greater than, less than, greater than or equal to, less than or equal to) to be a function Y1(x) = expression and graph it, or generate a table for it. You will have several values of the function calculated at various points.
  3. You can set your expression equal to 0 and find the particular value(s) of the variable (the unknown) that make the equality TRUE. That is called solving an equation.
I am not sure that it has a solver (solving an equation or an inequation) but you can always draw your expression as a function and explore the graph (SKTCH) to locate the roots (or zeros) of the functions (the values of the variable where the function equals zero.) That is called solving graphically.

Hope it helps.
Thank you for using FixYa and for rating this solution.

Nov 05, 2009 | Casio FX-7400G Plus Calculator

1 Answer

How do i use e key above in key

The number immediately following the e key is the power to which the value of e (2.718281828) is raised. Thus, e5 is equal to 148.4131591, the same as (2.718281828^5) If you press the e key without entering a number after it, an error results. Therefore, the only way to read your equation [500e^0.4] is to assume that e is first being raised to the power of 0.4, then multiplied by 500. To enter this on the Casio, press 5 0 0 [shift] [In] . 4
You will get 745.9123488
If the equation is intended to read (500 multiplied by e) then this value raised to the power of 0.4, that doesn't make sense, as e has no number following it.

Your second equation, 6.1e^0.014 would be entered 6 . 1 [shift] [In] . 0 1 4
This returns a value of 6.186006

You omit the 'power of' sign when you enter the equations.

Hope this helps.

Apr 06, 2009 | Casio FX-9750GPlus Calculator

Not finding what you are looking for?
Casio DR-T220 Calculator Logo

Related Topics:

283 people viewed this question

Ask a Question

Usually answered in minutes!

Top Casio Office Equipment & Supplies Experts


Level 3 Expert

102366 Answers

Les Dickinson
Les Dickinson

Level 3 Expert

18411 Answers

Piyal Perera
Piyal Perera

Level 3 Expert

528 Answers

Are you a Casio Office Equipment and Supply Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides