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Today’s lesson . . .

Today’s lesson. What: Scientific Notation with Negative exponents Why: To convert between numbers written in scientific notation (w/ neg. exponents) and numbers written in standard form. Who remembers what it is?.

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Today’s lesson . . .

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  1. Today’s lesson . . . What: Scientific Notation with Negative exponents Why: To convert between numbers written in scientific notation (w/ neg. exponents) and numbers written in standard form.

  2. Who remembers what it is? • We use scientific notation to write very ___________________ or very __________________ numbers. • Scientific notationis a # written as a • ____________________________________ sentence. • The leading factor MUST be a number greater than or equal to 1, but less than _____________. • The second factor must be a _________________ of 10. LARGE small multiplication ten (10) power Example: 2.5 x 10-5 What does it mean when the exponent is negative?

  3. It means that the # will be SUPER SMALL– a DECIMAL!! From scientific notation . . . Guided practice: 2.8 x 10-4 2. 2.8 x 10 -4

  4. On YOUR OWN: 2.8 x 10-4 2. 2.8 x 10 -4

  5. From standard form . . . Guided practice: 2.8 x 10-4 2. 2.8 x 10 -4

  6. ON YOUR OWN: 2.8 x 10-4 2. 2.8 x 10 -4

  7. Mixed practice: When do we need a positive exponent and when do we need a negative exponent???

  8. END OF LESSON The next slides are student copies of the notes for this lesson. These notes were handed out in class and filled-in as the lesson progressed. NOTE: The last slides in any lesson slideshow (entitled “Practice Work”) represent the homework assigned for that day.

  9. Math-7 NOTES DATE: ______/_______/_______ NAME: What: Scientific Notation with Negative Exponents Why: To convert between #’s written in scientific notation and #’s written in standard form. What is it? • We use scientific notation to write very ____________________________ or • very _________________________ numbers. • Scientific Notation: a # written as a _____________________________ sentence. • The leading factor MUST be a number greater than or • equal to 1, but less than ________________. • The second factor must be a ________________________ of 10. Example: 2.5 x 10-5 From scientific notation . . . examples:

  10. From standard form . . . examples:

  11. Mixed practice: When do we need a positive exponent and when do we need a negative exponent???

  12. NAME:__________________________________________________________________________NAME:__________________________________________________________________________ DATE: ______/_______/____________ PRACTICE WORK “Scientific notation” Remember: A really BIG # needs a positive exponent. A really SMALL # needs a negative exponent!

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