SN Multiplication Without a Calculator Multiply the non-exponent numbers Add the exponents of ten Example: (3 x 105)(2 x 106) =6 x 1011 Try: (4x103)(2x105) = (4x108)(5x10-2) = (1x10-2)(3x10-6) =

SN Division without a Calculator Divide first coefficient by second coefficient Subtract second exponent from first Example: (4x102)/(2x106) = 2x10-4 Try: (6x108)/(2x103) = (9x105)/(3x102) =

SN Addition & Subtraction without a Calculator Change number with the lowest exponent so they have the same exponent of ten Add or subtract the coefficients, keep the same exponent. Example: (3.76x104)+(5.5x102)= (3.76x104)+(0.055x104)= 3.82x104

Practice Addition & Subtraction (4.8x105) – (9.7x104) = (9.39x105) + (8x103) = (3x10-6) – (2x10-7) =

Using a Graphing Calculator Use the EE button to enter an exponent, NOT the ^ key To enter a negative exponent, use the (- ) key after the EE and before the exponent Never write an answer as 5.0e16!

Practice operations with Scientific Notation and Sig Figs (See Homework worksheet)