A ↗ Adding Fractions Calculator Add two fractions and reduce the result to lowest terms. Open tool → L ↗ LCM Calculator Find the least common multiple of two or more integers. Open tool → R ↗ Right Triangle Calculator Calculate hypotenuse, area, perimeter, and acute angles from two legs. Open tool → S ↗ Sample Size Calculator Estimate survey sample size from confidence level, margin of error, and population. Open tool → S ↗ Scientific Notation Calculator Convert a number to normalized scientific and engineering notation. Open tool → P ↗ Percentage Increase/Decrease Calculator Measure absolute and percentage change between an old and new value. Open tool → K ↗ Kinetic Energy Calculator Calculate kinetic energy from mass and velocity using standard SI units. Open tool → I ↗ Ideal Gas Law Calculator Solve pressure, volume, moles, or temperature using the ideal gas law. Open tool → S ↗ Speed Calculator Calculate speed from distance and elapsed time using selectable distance units. Open tool → S ↗ Slope Calculator Calculate rise-over-run slope, grade percentage, angle, and ratio. Open tool → F ↗ Fraction to Decimal Calculator Convert a fraction to decimal and percentage form. Open tool →