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College Algebra
Answer/Discussion to Practice Problems 
Tutorial 3: Scientific Notation



check markAnswer/Discussion to 1a

problem 1a


answer 1a1
*Decimal is at the end of the number

*Move decimal to create a number between 1 and 10


How many decimal places did we end up moving?
We started at the end of the number 123400 and moved it between the 1 and 2.  That looks like a move of 5 places.

What direction did it move?
Looks like we moved it to the left.

So, our count is +5.


answer 1a2

Note how the number we started with is a bigger number than the one we are multiplying by in the scientific notation.  When that is the case, we will end up with a positive exponent.




Check markAnswer/Discussion to 2a

problem 2a

answer 2a

*Move the decimal 6 to the left




Check markAnswer/Discussion to 3a

problem 3a

answer 3a2

*Move the decimal 5 to the right




Check markAnswer/Discussion to 3b

problem 3b

answer 3b

*Move the decimal 13 to the left



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Last revised on Dec. 5, 2009 by Kim Seward.
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