Videos and solutions to help Grade 8 students learn about exponential notation.

New York State Common Core Math Grade 8, Module 1, Lesson 1.

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Common Core For Grade 8

Student Outcomes

Students know what it means for a number to be raised to a power and how to represent the repeated multiplication symbolically.

Students know the reason for some bases requiring parentheses.

Opening Exercise

Without solving, what is another way to rewrite:

3 + 3 + 3 + 3 + 3 =

How would we rewrite:

3 × 3 × 3 × 3 × 3 =

5^{6} means 5 × 5 × 5 × 5 × 5 × 5

You have seen this kind of notation before, it is called exponential notation. In general, for any number x and any positive integer n,

x^{n }= (x • x • • • x) *n times*

Examples

5 × 5 × 5 × 5 × 5 × 5 =

9/7 × 9/7 × 9/7 × 9/ 7 =

(-4/11)

(-2)

(3.8)

The number x^{n} is called x raised to the n-th power, n is the exponent of x in x^{n} and x is the base of x^{n}.

x^{2} is called the square of x, and x^{3} is its cube.

You have seen this kind of notation before when you gave the expanded form of a whole number for powers of 10, it is called exponential notation.

Exercises

Exercises 1 - 10

Exercise 11

Will these products be positive or negative? How do you know?

Exercise 12

Is it necessary to do all of the calculations to determine the sign of the product? Why or why not?

Exercise 13

Fill in the blanks about whether the number is positive or negative.

If n is a positive even number, then (-55)

If n is a positive odd number, then (-72.4)

Exercise 14

Is Josie correct? How do you know?

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