100 LearnersLast updated on May 26th, 2025
Square of 685
The product of multiplying an integer by itself is the square of a number. Square is used in programming, calculating areas, and so on. In the topic, we will discuss the square of 685.
What is the Square of 685
The square of a number is the product of the number itself. The square of 685 is 685 × 685. The square of a number always ends in 0, 1, 4, 5, 6, or 9. We write it in math as 685², where 685 is the base and 2 is the exponent. The square of a positive and a negative number is always positive.
For example, 5² = 25; -5² = 25.
The square of 685 is 685 × 685 = 469,225.
Square of 685 in exponential form: 685²
Square of 685 in arithmetic form: 685 × 685
How to Calculate the Value of Square of 685
The square of a number is multiplying the number by itself. So, let’s learn how to find the square of a number. These are the common methods used to find the square of a number.
- By Multiplication Method
- Using a Formula
- Using a Calculator
By the Multiplication method
In this method, we will multiply the number by itself to find the square. The product here is the square of the number. Let’s find the square of 685.
Step 1: Identify the number. Here, the number is 685.
Step 2: Multiplying the number by itself, we get, 685 × 685 = 469,225.
The square of 685 is 469,225.
Using a Formula (a²)
In this method, the formula, a² is used to find the square of the number, where a is the number.
Step 1: Understanding the equation
Square of a number = a²
a² = a × a
Step 2: Identifying the number and substituting the value in the equation.
Here, ‘a’ is 685.
So: 685² = 685 × 685 = 469,225
By Using a Calculator
Using a calculator to find the square of a number is the easiest method. Let’s learn how to use a calculator to find the square of 685.
Step 1: Enter the number in the calculator Enter 685 in the calculator.
Step 2: Multiply the number by itself using the multiplication button (×). That is 685 × 685
Step 3: Press the equal to button to find the answer Here, the square of 685 is 469,225.
Tips and Tricks for the Square of 685
Tips and tricks make it easy for students to understand and learn the square of a number. To master the square of a number, these tips and tricks will help students.
- The square of an even number is always an even number. For example, 6² = 36
- The square of an odd number is always an odd number. For example, 5² = 25
- The last digit of the square of a number is always 0, 1, 4, 5, 6, or 9.
- If the square root of a number is a fraction or a decimal, then the number is not a perfect square. For example, √1.44 = 1.2
- The square root of a perfect square is always a whole number. For example, √144 = 12.
Common Mistakes to Avoid When Calculating the Square of 685
Mistakes are common among kids when doing math, especially when it is finding the square of a number. Let’s learn some common mistakes to master the squaring of a number.
Mistake 1
Calculation errors:
Calculation errors mostly happen when students skip the steps or else by swapping the digits. To avoid it, students should double-check the answer. They can double-check by finding the square root of the solution they found.
For example, the square of 25 is 625, and the square root of 625 is ±25.
Solved Examples on Square of 685
Problem 1
Find the length of the square, where the area of the square is 469,225 cm².
The area of a square = a²
So, the area of a square = 469,225 cm²
So, the length = √469,225 = 685.
The length of each side = 685 cm
Explanation
The length of a square is 685 cm. Because the area is 469,225 cm², the length is √469,225 = 685.
Problem 2
Jerry is planning to tile his square floor of length 685 feet. The cost to tile a foot is 5 dollars. Then how much will it cost to tile the full floor?
The length of the floor = 685 feet
The cost to tile 1 square foot of floor = 5 dollars.
To find the total cost to tile, we find the area of the floor,
Area of the floor = area of the square = a²
Here a = 685
Therefore, the area of the floor = 685²
= 685 × 685 = 469,225.
The cost to tile the floor = 469,225 × 5 = 2,346,125.
The total cost = 2,346,125 dollars
Explanation
To find the cost to tile the floor, we multiply the area of the floor by the cost to tile per foot. So, the total cost is 2,346,125 dollars.
Problem 3
Find the area of a circle whose radius is 685 meters.
The area of the circle = 1,474,475.65 m²
Explanation
The area of a circle = πr²
Here, r = 685
Therefore, the area of the circle = π × 685²
= 3.14 × 685 × 685
= 1,474,475.65 m².
Problem 4
The area of the square is 469,225 cm². Find the perimeter of the square.
The perimeter of the square is 2,740 cm.
Explanation
The area of the square = a²
Here, the area is 469,225 cm²
The length of the side is √469,225 = 685
Perimeter of the square = 4a
Here, a = 685
Therefore, the perimeter = 4 × 685 = 2,740 cm.
Problem 5
Find the square of 686.
The square of 686 is 470,596.
Explanation
The square of 686 is multiplying 686 by 686.
So, the square = 686 × 686 = 470,596.
FAQs on Square of 685
1.What is the square of 685?
2.What is the square root of 685?
3.Is 685 a prime number?
4.What are the first few multiples of 685?
5.What is the square of 684?
6.How does learning Algebra help students in United Arab Emirates make better decisions in daily life?
7.How can cultural or local activities in United Arab Emirates support learning Algebra topics such as Square of 685?
8.How do technology and digital tools in United Arab Emirates support learning Algebra and Square of 685?
9.Does learning Algebra support future career opportunities for students in United Arab Emirates?
Important Glossaries for Square of 685
- Perfect square: A number that is the square of an integer. For example, 469,225 is a perfect square because it is 685².
- Exponential form: A way of writing numbers using a base and an exponent. For example, 685² where 685 is the base and 2 is the exponent.
- Square root: The inverse operation of squaring a number. The square root of 469,225 is 685.
- Multiplier: A number by which another number is multiplied. For example, in 685 × 685, 685 is the multiplier.
- Perimeter: The total length around a two-dimensional shape. For a square, it is calculated as 4 times the side length.
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Jaskaran Singh Saluja
About the Author
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.
Fun Fact
: He loves to play the quiz with kids through algebra to make kids love it.
