Math Tools and Calculators
Here are some really useful applications to speed your way to that allimportant solution.
Tool / Calculator  Description 

Percentage Calculator  Enter two numbers, and see not only the percentages, but how they are calculated. 
Binary, Decimal, Hexadecimal Converter  Convert between Binary, Decimal and Hexadecimal. Can handle fractions and negatives. 
Prime Factorization Tool  Want to know if a number is Prime? Or if not, which prime numbers are it's factors? 
Straight Line Graph Calculator  If you have two points and need to know the straight line formula (y=mx+b) that connects them. 
Calculator  Enter formulas such as (3+2/9)^2 or sin(1/5), has history and even a slider for an "a" value. 
Scientific Calculator  Accepts formulas such as (3+2/9)^2 or sin(1/5) and you can also click on a keypad. 
Sigma Calculator  See what happens when you sum up a series of functions. 
Unit Converter  A neat yet powerful Unit Converter. Can convert length, mass, volume, temperature and more. Hundreds of imperial and metric units are supported 
Which day of the week were you born on  Calculate the day of the week for any date between 1582 and 4902 
Roman Numerals  Can convert from/to Roman Numerals. What year was MDMCLXXI ? 
Greatest Common Factor Tool  Find the greatest common factor of 2 or 3 numbers. Useful for simplifying fractions. 
Least Common Multiple Tool  Find the least common multiple of 2 or 3 numbers. Useful for adding or subtracting fractions. 
Full Precision Calculator  Calculate answers to full precision. Want to multiply to hundreds of digits of accuracy? Done! 
Quadratic Equation Solver  Have an equation like "ax^{2} + bx + c = 0"? We can solve it! 
Function Grapher and Calculator  You can plot two functions together, and even save the results as a web link. 
Equation Grapher  Graph equations like "x^{2}+y^{2}=2" 
3D Function Grapher  Plot an f(x,y) style function like x^2y^2 
Complex Number Calculator  Enter the formula, see the result. 
Mix Slider  Find the right amounts of a mixture. 
Power Set Maker  Makes Power Sets from Sets 
Decimal to Fraction Calculator  Converts Decimals to Fractional form, showing steps. 
Combinations and Permutations Calculator 
Calculate Combinations and Permutations 
All Factors Tool  Find all the factors of a number. 
Sigma Calculator  Add up a sequence. 
Vector Calculator  Convert between magnitude/angle and x,y. Add vectors. Dot product. 
Matrix Calculator  Do matrix calculations such as Determinant, Inverse and Multiplication 
Order of Operations Calculator  Order of Operations Calculator 
Geometry 

Area Calculation Tool  Calculate the areas of common shapes such as triangles, circles and ellipses 
Area of Circle Calculator  Calculate the area of a circle 
Polyhedron Models  Spin, explode and see the nets of over 100 polyhedra. 
Volume and Area of a Sphere Calculator  Calculate the volume, area, diamter and radius of a sphere 
Data 

Standard Deviation Calculator  Shows you the results at every stage of the calculation 
Confidence Interval Calculator  Confidence Interval Calculator 
ChiSquare Calculator  ChiSquare Test Calculator 
Correlation Calculator  Correlation Calculator 
Least Squares Calculator  Least Squares Regression Calculator 
Graph Paper Maker  Print or save graph paper 
Calculus 

Integral Approximation Calculator  Integral Approximation Calculator 
Fourier Series Grapher  Fourier Series Grapher 
Second Derivative Animation  Second Derivative Animation 
Money 

Investment/Loan Graph  Investment or Loan Graph 
Compound Interest Calculator  Compound Interest Calculator 
Counting Money  Its a game, but also useful for adding up money. 
Other Cool Stuff
App  Description 

Spiral Artist  Spiral Artist 
Symmetry Artist  Symmetry Artist 
Tessellation Artist  Tessellation Artist 
General Drawing Tool  General Drawing Tool 
Gravity Freeplay  A simulation of how suns, planets, moons, etc behave under the influence of gravity 
Moire Patterns  Explore the interesting "interference patterns" created by overlapping grids, lines, etc 
Estimation Games  Try your estimation skills 