Algebra 8.4 Scientific Notation.

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Presentation transcript:

Algebra 8.4 Scientific Notation

The Form A number is written in scientific notation when it is in the form

The Form Not Scientific Notation Scientific Notation

Large and small values One purpose of scientific notation is to allow you to write very large numbers and very small numbers easily, without lots of 0’s. Large numbers have positive exponents. 84,912 Small numbers have negative exponents. .000265

Scientific Notation Decimal Move decimal point right for positive exponent. Move decimal point left for negative exponent. 1. 3128 64,000 2. .39 3. .0000612 4.

Decimal Scientific Notation Move decimal point right or left to arrange one digit to the left of decimal point. 1. 52,314 Move left 4 places 2. 3.2 No need to move .0000428 3. Move right 5 places 602,000,000 Move left 8 places 4.

Exercises 283.4 .00000123 34,690 .039 Rewrite in decimal form. 1. 283.4 .00000123 2. Rewrite in scientific notation. 34,690 3. .039 4.

Computing with Scientific Notation Another purpose of scientific notation is to allow you to compute with large and small values easily using the rules of exponents. Numbers can be multiplied.

Computing with Scientific Notation Numbers can be divided.

Exercise Evaluate. Write answer in scientific notation. Associative property Simplify Rewrite in SN

Exercise Evaluate. Write answer in scientific notation. Associative property Subtract exponents Simplify to SN

Homework pg. 473 #16-46