The ability to convert numbers, fractions and decimals into percentages is necessary knowledge for many industries, including engineering, economics and business. It is equally useful in everyday life – we all know to tip 15%, but how many of us can calculate that quickly? Likewise, the ability to describe quantity with a percentage helps us visualize and understand the amount.

If you have ever wondered what a vehicle’s speed would be when converted from miles per hour to kilometers per hour, or even if you are a fan of cricket and want to be able to convert the reported speed of pitches, do not fret. With a little background and a calculator handy, you can easily convert speeds expressed in MPH to KPH.

Amperes, or amps, measure the flow of electricity as an electrical current, while watts determine the total amount of energy in a circuit. If you know the amount of amps and the voltage in a circuit, you can use those numbers to calculate how many watts is in the circuit, too. Make sure you know whether you’re working on an AC or DC circuit and if the voltage is line to line or line to

Fractions and decimal numbers are simply two different ways of representing numbers that are less than one. Since any number below one can be represented with either a fraction or a decimal, there are specific mathematic equations that allow you to figure out what the equivalent of a fraction would be in decimal form, and vice versa.

The British Thermal Unit (BTU) is the basic measure of heat energy in the Imperial system. One BTU is defined as the amount of heat necessary to raise 1 pound (0.454 kg) of water 1 degree Fahrenheit (0.55 degrees Celsius). Knowing the number of BTUs required per square foot of space is important in choosing the right size furnace and air conditioning system to heat and cool your house

Fahrenheit is a thermodynamic temperature scale. However, some formulas and sources use the Kelvin scale, based on degrees Centigrade. You can use a formula to convert Fahrenheit to Kelvin measurements.

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