What is the primary reason to teach and use Scientific Notation?

What is the primary reason to teach and use Scientific Notation?
 
  a) Convenient way to represent very large or small numbers.
   b) A number is changed to be the product of a number greater or equal to 1 or less than
  10 multiplied by a power of 10.
  c) Easiest way to convey the value of numbers in different contexts.
  d) To determined by the level of precision appropriate for that situation.

Question 2...

Discuss the challenges of using number lines and counters to teach about magnitude and direction of integers.
 
  What will be an ideal response?

Question 3...

Learning about exponents can be problematic. These are common misconceptions EXCEPT:
 
  a) Think of the two values as factors.
   b) Hear five three times and think multiplication.
   c) Write the equation as 5 x 3 rather than 5 x 5 x 5.
   d) Use repeated addition versus multiplication.

Question 4...

Describe a learning experience that can introduce students to irrational numbers.
 
  What will be an ideal response?

Question 5...

Identify the example of an irrational number.
 
  a) 3.5
  b) 2
  c)
  d) 1/2