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 TOPICS This page:   calculators and   computers    Search   Dr. Math See also the Internet Library:   calculators   using calculators and   computers   using computers HIGH SCHOOL About Math Analysis Algebra    basic algebra    equations/graphs/      translations    linear algebra    linear equations    polynomials Calculus Complex Numbers Calculators/    Computers Definitions Discrete Math    permutations/    combinations Exponents    Logarithms Fibonacci Sequence/   Golden Ratio Fractals Functions Geometry    Euclidean/plane      conic sections/        circles      constructions      coordinate plane      triangles/polygons    higher-dimensional      polyhedra    non-Euclidean    practical geometry    symmetry/tessellations History/Biography Interest Logic Negative Numbers Number Theory Physics/Chemistry Probability Projects Puzzles Sequences/Series Sets Square/Cube Roots Statistics Transcendental   Numbers Trigonometry 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 16-digit repetend using an 8-digit 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 g-h 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 TI-83+ to calculate how many feet of material are left on a roll. Factorial on TI-83 [09/24/1997] What is the origin of the TI-83 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 pre-defined 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 TI-82 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 8-bit CPU add up two four-digit 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? HP-38G Graphic Calculator [08/29/1998] I'm having trouble graphing on my HP-38G calculator. Can you help? Implied Multiplication and TI Calculators [05/02/2008] If I type 36/6(25-11*2) into my TI-85, I get an answer of 2. If I include a multiplication symbol to have 36/6*(25-11*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? Page: []

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