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Browse High School Calculators and Computers
Stars indicate particularly interesting answers or
good places to begin browsing.
Selected answers to common questions:
Twos complement.
 Dates that Read the Same Backwards and Forwards [02/02/2010]

A student sees a palindrome in the date 01 02 2010, and wonders how to
generate all such palindromic dates. Building on another math doctor's
work with date arithmetic, Doctor Carter shares a program written in C,
then goes on to explain the purpose of each line of code.
 Decimal To Fraction Conversion  A Simpler Version [11/25/2002]

A simpler version of the algorithm.
 Definition of Floating Point Data [07/02/2001]

What are 'floating point data'? How do they differ from an integer? What
are some examples?
 Determining File Compression Ratio [04/11/2001]

What equation will find compression ratio regardless of the time it took
to compress?
 Displaying Large Repetends on Small Calculators [05/31/2002]

How can I find a 16digit repetend using an 8digit calculator?
 EE Key on a Calculator [10/25/1999]

What does "EE" on the calculator stand for?
 Equivalence Relations [08/12/2003]

If I have a function that maps from R to R (where R is the reals) and
a set of functions, say O(f), for g where there exist constants c and
a in R+ (positive reals), where g(x) is less than or equal to c
f(x) for x greater than a, how would I define a relation, say Q, on
the set of functions mapping R to R by putting (g,h) in R iff gh is
in O(f)?
 Erlang B [10/22/2002]

I need to know how to calculate the addition of numbers using
logarithms: 1 + 2 + 3. There is a step that requires adding numbers
that exceed Excel's limits. How can I use logs to add the numbers?
 Exact Answers for Square Roots [04/16/2006]

My teacher says that one of the problems with using calculators is
that you don't always get exact answers. I don't understand why.
Aren't calculators accurate?
 Exponents on a Scientific Calculator [08/21/1997]

My problem is that I am not using the EXP key correctly...
 Expressing Arccos in Terms of Arctan [02/24/1997]

How do you express Arccos in terms of Arctan?
 Fabric Left on a Roll [03/15/2001]

I am going to write a program for my TI83+ to calculate how many feet of
material are left on a roll.
 Factorial on TI83 [09/24/1997]

What is the origin of the TI83 definition of factorial (in increments of
0.5) and where is it used? What resources would you suggest?
 Finding All Combinations of Numbers [07/23/2002]

Programs in C++ and Visual Basic for finding all possible combinations
of numbers using a predefined set.
 Finding an Angle [08/09/2002]

I need to know how to calculate an angle between two points.
 Finding Percentages on a Calculator [06/22/2006]

How does the percent key on a calculator work? How do I use it to find
a percent of a number?
 Finding Pi in C++ [10/10/2001]

I want to write a program in C++ to find the first 100 digits in Pi
following the sequence: 4(4/3)+(4/5)(4/7)+...
 Finding Roots on a Calculator [04/22/2001]

How can I use the equation HPR = (1.667)^(1/5) on a calculator that does
not have a fifth root key?
 Floating 2 [06/12/2001]

Start with the number 2 on the far left side, then float the number 2 to
the far right side; the new number must be three as large as the old
number.
 Fraction Algorithm [03/19/2002]

I have been having trouble making an application that can convert a
finite decimal to a fraction without doing 78349/1000000.
 Games for TI Calculators [6/6/1995]

Where can I find programs for a TI82 calculator?
 Generating Permutations With a Computer [06/20/2002]

I want to write a computer program to solve 'Jumble' word puzzles.
 Generating Permutations With a Computer [06/20/2002]

I have a friend named REBECCA. How can I generate all the
distinguishable permutations of all the letters of her name?
 Generating Random Numbers [02/24/2001]

Would you know of any congruential models for the generation of random
numbers?
 Generating Random Numbers with Specified Probabilities [08/10/2003]

Given an evenly distributed Pseudo Random Number (PRN) generator (with
each generated outcome having the same probability), how can I
generate outcomes with specified probabilities?
 Graphing Peculiarity [07/24/2002]

When I use a calculator to graph one form of an equation it works
fine; but when I use a different form, it doesn't work. What's going
on?
 High School Math Software [7/12/1996]

Where can I get good shareware/freeware programs that deal with high
school math topics?
 History of Writing Decimals and Number Lines [10/28/1998]

Why, on a number line, are the negative numbers are on the left? When you
deal with decimals, why are the whole numbers are on the left?
 How a Calculator Determines Values of Trig Functions [03/19/2005]

I'm interested in how my calculator finds the answer of sin(pi/4) or
tan(pi/6), for example. Does it use power series?
 How a CPU Adds Decimal Numbers [10/22/2000]

How does an 8bit CPU add up two fourdigit decimal numbers, and why does
it take four operations to do so?
 How Many Triangles? [10/30/2001]

If we join one point on each of the three sides of a triangle to make
another triangle, there are three triangles with vertices pointing up.
How many triangles will have vertices pointing up if there are n points?
 HP38G Graphic Calculator [08/29/1998]

I'm having trouble graphing on my HP38G calculator. Can you help?
 Implied Multiplication and TI Calculators [05/02/2008]

If I type 36/6(2511*2) into my TI85, I get an answer of 2. If I
include a multiplication symbol to have 36/6*(2511*2), I get an
answer of 18. I thought that when the 6 is written right up against
the parenthesis, the multiplication is implied. Why am I getting two
different answers?
 Integer Modulus vs. Remainder [03/14/2002]

We were taught by our computer professors that the modulus is the
remainder of an integer division, but your discussion leads me to believe
this is not quite true.
 Interpreting 2^3^2 [04/26/2001]

Why is 2^3^2 interpreted as 2^(3^2) = 512 instead of (2^3)^2 = 64?
 Introduction to Fractals [09/02/1998]

Can you give me some basic information on fractals? How would you create
one?
 Inverse Sine Function on a Calculator [5/14/1996]

Finding Arcsin(y) using a calculator.
 Julian to Calendar Date Conversion [02/24/2001]

Can you show me an algorithm to convert Julian date values to calendar
date values? For example, Julian date 2451964 = 02/24/2001.
 KaleidoTile [11/15/1995]

I would appreciate it if you would tell me a bit about KaleidoTile.
 Large Prime Numbers [12/17/1997]

Is there an algorithm to determine whether a very large number is prime?
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