1. Warm Up
Multiply
15 x 1000
3.2 x 100
7.16 x 10,000
261 x
3.2 x
52.81 x 0.001
Solution
15,000
320
71,600

2. 4.2 Scientific Notation
Academic Objective:
Writing Objective:
Homework:
We will read, write and compare rational numbers in scientific notation.
I can write a value in Standard Form and Scientific Notation.
Practice Workbook 4.2
Pp 51-52; All

3. Scientific Notation has only one number left of the decimal.
What is Standard form?
What is scientific notation?
Scientific Notation has only one number left of the decimal.
In the example:
5 is 5.0, the 5 is left of the decimal.
3.25 has the 3 left of the decimal.

4. Standard to Scientific
How do we go from Standard Form to Scientific Notation?
What’s the rule?
Standard to Scientific
Moving the Decimal:
Left makes a positive exponent
Right makes a negative exponent

5. Scientific to Standard
How do we go from Scientific to Standard?
What’s the Rule?
Scientific to Standard
Moving the Decimal:
Positive Exponent moves Right
Negative Exponent moves Left

6. You only get out what you put into it!

7. Class Work: Try the problems. Check your answers with your neighbor.
Write the numbers in scientific notation.
400
7,300,000
63,000,000,000
230,000
2,420,000
105
Solutions:
4 x 102
7.3 x 106
6.3 x 1010
2.3 x 105
2.42 x 106
1.05 x 102

8. Class Work: Try the problems. Check your answers with your neighbor.
Write the number 30 x 107 in scientific notation.
Write the numbers in scientific notation
0.0237
Solutions
3 x 108
4.75 x 10-3
5.26 x 10-6
8.2 x 10-9
2.37 x 10-2

9. Class Work: Try the problems. Check your answers with your neighbor.
Write the number in standard form.
3.5 x 103
2.48 x 106
5.1 x 10-4
9.16 x 10-2
Solution
3,500
2,480,000
0.0916