Use scientific notation.

Using scientific notation during calculations can help reduce simple mistakes. Just as a reminder, below are the rules for making calculations using scientific notation.

Addition and Subtraction	Convert numbers to the same power of 10 and add or subtract the digits:
	$0.03115 + 0.00023$
	$3.115 \ x \ 10^{-2} + 2.3 \ x \ 10^{-4} =$
	$3.115 \ x \ 10^{-2} + 0.023 \ x \ 10^{-2} =$
	$3.138 \ x \ 10^{-2} = 0.03138$
Multiplication	Multiply the digits and add the exponents:
	$6.0 \ x \ 10^{23} \times 2 \ x \ 10^{-4} =$
	$12.0 \ x \ 10^{19} =$
	$1.2 \ x \ 10^{20}$
Division	Divide the digits and substract the exponents:
	$6.0 \ x \ 10^{23} \div 2 \ x \ 10^{-4} =$
	$3.0 \ x \ 10^{27}$
Powers	Raise the digit to the power and multiply the exponents:
	$\left(3.0 \ x \ 10^{2}\right)^3 =$
	$27.0 \ x \ 10^{6} =$
	$2.70 \ x \ 10^{7} =$