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•Calculation
(4.0 × 3.5) × 10 4+(–6) = 14 × 10 –2 = 1.4 × 10 –1
•Calculator Calculation
Most people use an electronic calculator for these types of calculations. On most, but not all, calculators, you
would carry out the above multiplication problem in the following way:
(4.0 × 10 4 )(3.5 × 10 –6 )
When entering the exponential terms, the exponents (4) and (–6) are entered as [EXP] then 4, and [EXP] then
[+/–] 6. Therefore, 4.0 × 10 4 is entered as 4.0 [EXP] 4, and 3.5 × 10 –6 is entered as 3.5 [EXP] [+/–] 6. Note that
the × sign within the exponential must not be entered. Some calculators have an [EE] key for exponents.
The calculation can be carried out with the following sequence of key strokes:
4.0 [ EXP] 4 [ × ] 3.5 [ EXP] [+/–] 6 [=]
The calculator will display the answer either as just 0.14, or in exponential form as 1.4–01 , or as 1.4
depending on the brand of calculator. –01 •Comment
Always write out your answer in exponential notation, rather than calculator format.
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This note was uploaded on 09/15/2009 for the course CHEM 102 taught by Professor Bastos during the Spring '08 term at Adelphi.
 Spring '08
 BASTOS
 pH

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