2. Why Use Scientific Notation?
The Andromeda Galaxy
(closest to the Milky way)
contains at least
200,000,000,000 stars.
3. Scientific Notation…..
►a # written with two factors
► one factor is
less than 10 AND 1 or greater
► the other factor is a power of 10
(a positive or negative power)
Example: 2300 = 2.3 x 103
Hint: When multiplying by powers of ten
move the decimal either right or left
4. Why Use Scientific Notation?
The Andromeda Galaxy
(closest to the Milky way)
contains at least
200,000,000,000 stars.
2 x 10 11
5. Standard form to Scientific Notation
80,600 = 8.06 x 104
A) 15,010 = 1.501x10 4
B) 30,660,000,000 =3.066 x10
10
6. How do you change the
number back from
scientific notation into
standard form?
You just do the opposite!
The exponent tells you which
direction to move your decimal
to get it back where it was.
Ex. 4.5 x 10 =
5
450,000
7. Scientific Notation to Standard form:
• 2.65 x 104 = • 8.7 x 10-4 =
26,500 0.00087
• 5.245 x 103 = d) 1.2 x 10-2 =
5,245 0.012
e) 4.34 x 10 -5 = f) 3.22 x 1015 =
0.0000434 3,220,000,000,000,000
