Chapter 10: Problem 63
To help find cube roots, complete this list of perfect cubes. $$1^{3}=\quad 2^{3}=\quad 3^{3}=\quad 4^{3}=\quad 5^{3}=$$ $$6^{3}=\quad 7^{3}=\quad 8^{3}=\quad 9^{3}=\quad 10^{3}=$$
Short Answer
Expert verified
1, 8, 27, 64, 125, 216, 343, 512, 729, 1000
Step by step solution
01
- Calculate the first perfect cube
Calculate the cube of 1: \[1^3 = 1 \cdot 1 \cdot 1 = 1\]
02
- Calculate the second perfect cube
Calculate the cube of 2: \[2^3 = 2 \cdot 2 \cdot 2 = 8\]
03
- Calculate the third perfect cube
Calculate the cube of 3: \[3^3 = 3 \cdot 3 \cdot 3 = 27\]
04
- Calculate the fourth perfect cube
Calculate the cube of 4: \[4^3 = 4 \cdot 4 \cdot 4 = 64\]
05
- Calculate the fifth perfect cube
Calculate the cube of 5: \[5^3 = 5 \cdot 5 \cdot 5 = 125\]
06
- Calculate the sixth perfect cube
Calculate the cube of 6: \[6^3 = 6 \cdot 6 \cdot 6 = 216\]
07
- Calculate the seventh perfect cube
Calculate the cube of 7: \[7^3 = 7 \cdot 7 \cdot 7 = 343\]
08
- Calculate the eighth perfect cube
Calculate the cube of 8: \[8^3 = 8 \cdot 8 \cdot 8 = 512\]
09
- Calculate the ninth perfect cube
Calculate the cube of 9: \[9^3 = 9 \cdot 9 \cdot 9 = 729\]
10
- Calculate the tenth perfect cube
Calculate the cube of 10: \[10^3 = 10 \cdot 10 \cdot 10 = 1000\]
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Key Concepts
These are the key concepts you need to understand to accurately answer the question.
Cube Roots
A cube root is a number that, when multiplied by itself three times, equals a given number. For example, the cube root of 27 is 3 because \(3 \times 3 \times 3 = 27\). Understanding cube roots is essential to recognizing perfect cubes.
- To find cube roots, you reverse the process of cubing a number.
- If someone gives you a number, say 125, you need to find a number which, when cubed, results in 125.
- Here, the cube root of 125 is 5 because \(5^3 = 125\).
Exponents
Exponents are a way of representing repeated multiplication of the same number by itself. In our context, we specifically deal with cubes, which means using the exponent 3.
- For example, \(3^3\) means multiplying 3 by itself three times: \(3\times 3 \times 3 = 27\).
- This is unlike squaring a number, which uses an exponent of 2.
- Understanding exponents simplifies calculation and notation, letting you express large numbers concisely.
Multiplication
Multiplication is a basic arithmetic operation that combines groups of the same size. When calculating cubes, you perform multiplication multiple times with the same number.
- For instance, \(4^3 = 4 \times 4 \times 4\) shows three multiplications with the number 4.
- Mastering this concept allows tackling cubes and cube roots smoothly since you need to multiply the number multiple times to get the perfect cube.
- Practicing multiplication tables helps in quickly recognizing and solving cubes of numbers.