Chapter 1.5: Cubes and Cube Roots (Evaluating Expressions using PEMDAS)
Goal: 1) Find the Cube and Cube Root of a number
2) Evaluate numerical expressions involving whole number exponents
Example 1: Find the cube of a number
What is length of the edge of the cube? ______
How do you find the Volume of the Cube?
Another way of writing this is:
___________________
3
2
_________
The cube of 2 is ___________ à We call this number a perfect cube.
Example 2:
Find the cube of 5.
Example 3: Finding the cube root
The square root of a perfect square is always a whole number
!
27= _____
Think: What number times itself times itself will
equal 27? Think of the Cube with an Volume of 27, what will the length of the edge of the
cube be?
Examples 4: Real World Problems
A shipping company ships its merchandise in 10 foot cubes. Each package shipped in the cube
is 1 ft x 1 ft x 1 ft cubes. How many packages can fit into the 10 foot cubes?
Example 5: Evaluate numerical expressions using Order of Operations/PEMDAS
P____________________________
E____________________________
M____________________________
From left to right
D____________________________
A____________________________
From left to right
S____________________________
2
2
2
3 +4
2
3
7 x2 +3
3
2
2
10 – 4 x 5