Today in Algebra 2

• Go over homework• Notes: you will need a calculator

– Scientific Notation• Homework

Examplesa) 0.000000631

b) 43,020,000,000

c) 843,050,000,000,000

d) 0.00000000924

Examplesa) 7.563 107

b) 5.6204 10–8

c) 2.1340 10–12

d) 9.035 1014

Arithmetic• Final answer must be in scientific notation• Examplesa) 5.6204 10–8 + 1.305 10–8

b) 3.54 107 + 8.35 107

Practice

a) (3.4507 108)(2.61 104) b) (4.503 10-3)(3.21 105)

8

10

7.21 10c)3.62 10

Homework

pg 259:46-57all, 59-63odd

Scientific Notation• Used for very large or very small numbers,

eliminates the need for writing a lot of zeroes.• Example 7,532,000,000 is written as

7.532 109

• Must have a number from 1 to 9 left of decimal, all remaining numbers are to the right.

• The exponent tells how many places the decimal is moved.

• Positive exponent means decimal was moved to the left, negative exponent decimal was moved to the right.