Reference

For science classes, I would advise learning the information which is posted below.  When do conversion it comes in handy to know the symbols and unit of measurement.

 Metric US Customary System Base Unit Symbol Base Unit Symbol Length Meter m Yard yd Mass Gram g Ounce oz Volume Liter L Quart qt Time Second S Second S

 US Customary System Length Volume Weight 12 inches (in) 1 foot (ft) 1 cup (c) 8 ounces (oz) 1 pound (lb) 16 ounces (oz) 3 feet (ft) 1 yard (yd) or 36 inches 1 pint (pt) 2 cups (c) 1 ton 2000 pounds (lbs) 1 mile (mi) 5280 feet (ft) or 1760 yards (yd) 1 quart (qt) 2 pints (pt) or 4 cups (c) 1 gallon (gal) 4 quarts (qt) or 16 cups (c)

 Metric System Prefix Symbol Meaning Numerical Value Scientific Notation Giga G Billion 1,000,000,000. 109 Mega M Million 1,000,000. 106 Kilo k Thousand 1,000 103 Deci d Tenth 0.1 10-1 Centi c Hundredth .01 10-2 Milli m Thousandth 0.001 10-3 Micro μ or mc Millionth 0.000,001 10-6 Nano N Billionth 0.000,000,001 10-9 Scientific Notation

In scientific notation, there is a coefficient and exponent.  A coefficient is a number between 1 to 9.9.  An exponent is any positive or negative whole number.

In order to convert a standard number to scientific notation, move the decimal point to give a number between 1 and 10.  Multiply the result by 10ˣ, where x = number of places the decimal was moved.  If the decimal left, x is positive, and if it is to the right, x will be negative.

When the exponent x is positive, you will move the decimal point x places to the right.  When the exponent is negative, you move the decimal point x places to the left.