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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.
 Binary Conversion [01/07/1998]

In an adult computer course we are supposed convert binary numbers to
real numbers and binary to hexadecimal.
 Decimal To Fraction Conversion [06/25/1998]

I am trying to find a method (one that can be programmed on a PC) to
convert the decimal part of a real number to a fraction represented by
integers for the numerator and denominator.
 Dividing by Zero on a Calculator or Computer [2/12/1996]

Whenever I try to divide a number by 0, I get an error on both my
computer and calculator. Please explain to me why this can't be done.
 Year 2000 (Y2K) Problem [07/26/1998]

Can you explain the Year 2000 problem in layman's terms? Why is it so
hard to fix?
 2D Graphing Software: Maple [7/15/1996]

Could you recommend any PC software that could help me study hyperbolas
and other curves?
 3D Points to a 2D computer screen [07/25/1997]

I am trying to write a 3D graphics engine that takes 8 points with their
own (X,Y,Z) coordinates to plot a CUBE in 3D space...
 Algorithm for Finding Pi, in C [02/14/1998]

I would like to know how to implement various algorithms for finding pi
in the C language.
 Algorithm for Simple Fractional Exponents [03/14/2002]

How can I explain to my program how to resolve simple fractional
exponents using only addition, subtraction, multiplication, division,
square, and square root?
 AnalogtoDigital Conversion [02/07/2001]

How do I do an analogtodigital conversion of text and strings, or of
tactile senses?
 ArbitraryPrecision Arithmetic [08/08/2003]

How could I use QBasic V4.5's math to compute numbers that are greater
than 10^15 in the quickest way, and yet display every single digit in
the product?
 Arccos Algorithms and Computer Calculators [03/21/1998]

I need an algorithm to find the arccos of a value.
 Arc Midpoint [07/17/2001]

I'm trying to figure out the midpoint of an arc where I know the start
and end points of the arc and the radius only.
 ASCII or EBCDIC? [05/11/2002]

Given a bit sequence like 01000001, how can I tell if it's ASCII or
EBCDIC?
 Binary Division and Negative Binary Numbers [02/24/2002]

Suppose you enter 11111000 into a binary calculator. How would it know
whether that is to be 248 or 8? How does the computer begin the division
process? What does it do when it cannot right shift the bits?
 Binary Search Trees [02/06/2003]

Which of the following sequences represent(s) an order of insertion
that will result in a binary search tree where each node in the tree
has the same number of nodes in its left and right subtrees?...
 Binary Subtraction [07/04/2003]

I need help understanding the rules of subtracting binary numbers when
the subtrahend is larger then the minuend.
 Bits, Bytes [04/28/2003]

A Web page of 10 megabytes is being retrieved from a Web server. What
is the time to transfer the page over a modem operating at 28.8kbps?
 Boolean Numbers [04/01/2003]

Our C Programming course said a Boolean number was a number that was
either true or false. I'm not sure what a true or false number is.
 C++ Abundant Number Program [01/26/2001]

Is there a computer science C++ formula that allows the user to find
whether a number is abundant, deficient, or perfect?
 Calculate the Derivative for Sqrt(x^5) [03/09/2003]

Why does the calculator fail when I calculate the derivative for
sqrt(x^5)?
 Calculating Sine Without Using the Sine Key or a Table [01/02/2004]

I'm curious what the arithmetic is behind the trig functions. For
example, to evaluate sin(48), what math process could I use if I
didn't have a calculator?
 Calculator Addition [6/30/1996]

How does a calculator add?
 Calculator for Algebra I and Physical Science [8/11/1995]

My son is taking Algebra I and a first course in physical science this
semester. Do you have a recommendation for a calculator?
 Calculators and Irrational Numbers [05/02/2001]

When I square the square root of 11 on any calculator, I get the answer
11 (exactly). That seems to indicate that the square root of 11 is a
rational number, but it's not. Can you explain this?
 Calculators and Trig Functions [12/03/1996]

How do calculators solve trigonometric functions? Is there any way to
determine the y value on a graph of the arc subtended by the angle theta?
 Calculators  CORDIC Method [05/16/1999]

How can a computer or calculator calculate square roots, cube roots, Xth
root, x^y, logarithm, sine, cosine, ...?
 Chaos Theory and Computers [2/4/1996]

I have happened upon an equation which can create a fractal that
demonstrates chaos theory graphically. Since the computer cannot learn,
and chaos theory is based on a lack of pattern, how is the computer able
to compute this?
 Check Digits in Payroll or Stock Numbers [11/16/1996]

What is the set of calculations required to get a unique check digit?
 Combining Multiple Signals in Data Transmission [02/18/2001]

How can a cable carry so much information? How can data carriers compress
multiple signals and then pull them apart again?
 Combining Numbers Reversibly [06/04/2003]

I have been trying to find a way of getting two different numbers,
combining them through a formula that will give a final number. From
that new number it should be possible to get the two numbers back.
 Compute 16bit One's Complement Sum [03/20/2002]

In my TCP/IP book it says, "to compute the IP checksum for outgoing datagram, the value of checksum field is set to zero, then the 16bit one's complement sum of the header is calculated (i.e. the entire header is considered a sequence of 16bit words)"  but I do not know how to compute the one's complement sum.
 Computers and Calculators in Math Today [12/6/1995]

For a term paper on math, I need to know how computers and calculators
play a big part in math today.
 Computers and Trigonometric Functions [02/11/1997]

How do computers and calculators calculate values for sine, cosine, and
tangent?
 Computers: Defining Logical Operations [05/21/1998]

Can you tell me the meaning of the following logical operations: AND, OR,
XOR, NAND, NOR, NOT?
 Converting a Decimal Hour [11/22/2001]

How do I convert 1.7 hours into hours, min, sec? Is there a standard
formula I can use? I would like to put this into an Excel spreadsheet.
 Converting Bits to Megabytes [02/12/2001]

The human brain will store 100 trillion bits in its lifetime. How many
million megabytes can your brain store?
 Converting HH:MM to Minutes in Excel [06/25/2003]

Is there an easy method (i.e. any formula or a macro) for converting
Hours:Minutes (HH:MM) to Minutes in Excel?
 C++ Program to Convert Decimal to Binary [10/26/1999]

Can you show me a C++ routine that converts decimal numbers to binary?
 Cyclic Redundancy Check [06/26/2002]

I understand how cyclic redundancy checks work, but I fail to see how
appending zeros to the message string (before the division) provides an
advantage.
 Data Compression [08/10/2003]

Is there an algorithm that can reduce any binary number to a much
smaller binary number, then later be reversed to regain the original
number? It has to work for any binary number.
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