Last updated on June 3rd, 2025
When a number is multiplied by itself thrice, the resultant number is called the cube of a number. Cubing is used when comparing sizes of objects or things with cubic measurements. In this topic, we shall learn about cubes of 686.
A cube number is a value obtained by raising a number to the power of 3, or by multiplying the number by itself three times. When you cube a positive number, the result is always positive. When you cube a negative number, the result is always negative. This is because a negative number multiplied by itself three times results in a negative number.
The cube of 686 can be written as 686³, which is the exponential form. Or it can also be written in arithmetic form as, 686 × 686 × 686.
In order to check whether a number is a cube number or not, we can use the following three methods: multiplication method, factor formula (a³), or by using a calculator. These three methods will help students to cube the numbers faster and easier without feeling confused or stuck while evaluating the answers.
The multiplication method is a process in mathematics used to find the product of two numbers or quantities by combining them through repeated addition. It is a fundamental operation that forms the basis for more complex mathematical concepts.
Step 1: Write down the cube of the given number. 686³ = 686 × 686 × 686
Step 2: You get 322,486,432 as the answer. Hence, the cube of 686 is 322,486,432.
The formula (a + b)³ is a binomial formula for finding the cube of a number. The formula is expanded as a³ + 3a²b + 3ab² + b³.
Step 1: Split the number 686 into two parts. Let a = 680 and b = 6, so a + b = 686
Step 2: Now, apply the formula (a + b)³ = a³ + 3a²b + 3ab² + b³
Step 3: Calculate each term a³= 680³ 3a²b = 3 × 680² × 6 3ab² = 3 × 680 × 6² b³ = 6³
Step 4: Add all the terms together:
(a + b)³ = a³ + 3a²b + 3ab² + b³
(680 + 6)³= 680³ + 3 × 680² × 6 + 3 × 680 × 6² + 6³
686³ = 314,432,000 + 82,080 + 7,344 + 216
686³ = 322,486,432
Step 5: Hence, the cube of 686 is 322,486,432.
To find the cube of 686 using a calculator, input the number 686 and use the cube function (if available) or multiply 686 × 686 × 686. This operation calculates the value of 686³, resulting in 322,486,432. It’s a quick way to determine the cube without manual computation.
Step 1: Ensure the calculator is functioning properly.
Step 2: Press 6 followed by 8 and 6
Step 3: If the calculator has a cube function, press it to calculate 686³.
Step 4: If there is no cube function on the calculator, simply multiply 686 three times manually.
Step 5: The calculator will display 322,486,432.
There are some typical errors that students might make during the process of cubing a number. Let us take a look at five of the major mistakes that students might make:
What is the cube and cube root of 686?
The cube of 686 is 322,486,432 and the cube root of 686 is approximately 8.807.
First, let’s find the cube of 686.
We know that the cube of a number, such that x³ = y Where x is the given number, and y is the cubed value of that number
So, we get 686³ = 322,486,432
Next, we must find the cube root of 686
We know that the cube root of a number ‘x’ is x(1/3) Where x is the given number, and y is the cube root value of the number
So, we get 686(1/3) = 8.807
Hence, the cube of 686 is 322,486,432, and the cube root of 686 is approximately 8.807.
If the side length of the cube is 686 cm, what is the volume?
The volume is 322,486,432 cm³.
Use the volume formula for a cube V = Side³. Substitute 686 for the side length: V = 686³ = 322,486,432 cm³.
How much larger is 686³ than 680³?
686³ – 680³ = 322,486,432 - 314,432,000 = 8,054,432.
First find the cube of 686³, that is 322,486,432 Next, find the cube of 680³, which is 314,432,000 Now, find the difference between them using the subtraction method. 322,486,432 – 314,432,000 = 8,054,432 Therefore, 686³ is 8,054,432 larger than 680³.
If a cube with a side length of 686 cm is compared to a cube with a side length of 300 cm, how much larger is the volume of the larger cube?
The volume of the cube with a side length of 686 cm is 322,486,432 cm³
To find its volume, we multiply the side length by itself three times (since it’s a 3-dimensional object).
Cubing 686 means multiplying 686 by itself three times: 686 × 686 = 470,596, and then 470,596 × 686 = 322,486,432.
The unit of volume is cubic centimeters (cm³), because we are calculating the space inside the cube.
Therefore, the volume of the cube is 322,486,432 cm³.
Estimate the cube 685.9 using the cube 686.
The cube of 685.9 is approximately 322,486,432.
First, identify the cube of 686, The cube of 686 is 686³ = 322,486,432.
Since 685.9 is only a tiny bit less than 686, the cube of 685.9 will be almost the same as the cube of 686.
The cube of 685.9 is approximately 322,486,432 because the difference between 685.9 and 686 is very small.
So, we can approximate the value as 322,486,432.
Jaskaran Singh Saluja is a math wizard with nearly three years of experience as a math teacher. His expertise is in algebra, so he can make algebra classes interesting by turning tricky equations into simple puzzles.
: He loves to play the quiz with kids through algebra to make kids love it.