126 LearnersLast updated on May 30th, 2025
Square of 390
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 this topic, we will discuss the square of 390.
What is the Square of 390
The square of a number is the product of the number with itself.
The square of 390 is 390 × 390.
The square of a number always ends in 0, 1, 4, 5, 6, or 9.
We write it in math as 390², where 390 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 390 is 390 × 390 = 152100.
Square of 390 in exponential form: 390²
Square of 390 in arithmetic form: 390 × 390
How to Calculate the Value of Square of 390
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 390.
Step 1: Identify the number. Here, the number is 390.
Step 2: Multiplying the number by itself, we get, 390 × 390 = 152100.
The square of 390 is 152100.
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 390.
So: 390² = 390 × 390 = 152100
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 390.
Step 1: Enter the number in the calculator Enter 390 in the calculator.
Step 2: Multiply the number by itself using the multiplication button (×) That is 390 × 390
Step 3: Press the equal to button to find the answer Here, the square of 390 is 152100.
Tips and Tricks for the Square of 390
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 390
Mistakes are common among kids when doing math, especially when it comes to 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 swap 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.
Mistake 2
Errors will be using the formula.
The formula to find the square of the number is a². Instead, students may use 390² with (3 + 9 + 0)² or (300 + 90)². So students should check and use the correct formula and double-check the answers to avoid all the confusion.
Mistake 3
Confusing with square and square root.
Not understanding the concept of square and square root can lead to confusion in students. To avoid it, students should understand the concept that square and square root are inverse operations. The square of 5 is 25 and the square root of 25 is ±5.
Mistake 4
Errors in parentheses.
Ignoring the parentheses when finding the square of a number can lead to errors. So, students should understand parentheses and perform the operations in the correct order to avoid errors.
Mistake 5
Not practicing regularly.
Regular practice is required to master the square of a number. So students should do regular practice to avoid errors.
Solved Examples on Square of 390
Problem 1
Find the length of the square, where the area of the square is 152100 cm².
The area of a square = a² So, the area of a square = 152100 cm² So, the length = √152100 = 390 The length of each side = 390 cm
Explanation
The length of a square is 390 cm.
Because the area is 152100 cm², the length is √152100 = 390.
Problem 2
Sarah is planning to tile her square floor with length 390 feet. The cost to tile a foot is 2 dollars. How much will it cost to tile the entire floor?
The length of the floor = 390 feet The cost to tile 1 square foot of floor = 2 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 = 390 Therefore, the area of the floor = 390² = 390 × 390 = 152100. The cost to tile the floor = 152100 × 2 = 304200. The total cost = 304200 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 304200 dollars.
Problem 3
Find the area of a circle whose radius is 390 meters.
The area of the circle = 477,522 m²
Explanation
The area of a circle = πr²
Here, r = 390
Therefore, the area of the circle = π × 390² = 3.14 × 390 × 390 = 477,522 m².
Problem 4
The area of the square is 152100 cm². Find the perimeter of the square.
The perimeter of the square is
Explanation
The area of the square = a²
Here, the area is 152100 cm²
The length of the side is √152100 = 390
Perimeter of the square = 4a
Here, a = 390
Therefore, the perimeter = 4 × 390 = 1560.
Problem 5
Find the square of 391.
The square of 391 is 152881.
Explanation
The square of 391 is multiplying 391 by 391.
So, the square = 391 × 391 = 152881.
FAQs on Square of 390
1.What is the square of 390?
2.What is the square root of 390?
3.Is 390 a prime number?
4.What are the first few multiples of 390?
5.What is the square of 389?
6.How does learning Algebra help students in United States make better decisions in daily life?
7.How can cultural or local activities in United States support learning Algebra topics such as Square of 390?
8.How do technology and digital tools in United States support learning Algebra and Square of 390?
9.Does learning Algebra support future career opportunities for students in United States?
Important Glossaries for Square of 390.
- Prime number: A number that is only divisible by 1 and itself. For example, 2, 3, 5, 7, 11, etc.
- Exponential form: A way of writing numbers in the form of a power. For example, 9² where 9 is the base and 2 is the exponent.
- Square: The result of multiplying a number by itself. For example, the square of 5 is 5 × 5 = 25.
- Square root: The inverse operation of squaring a number. The square root of a number is a value that, when multiplied by itself, gives the original number.
- Perfect square: A number that is the square of an integer. For example, 64 is a perfect square because it is 8².
Explore More algebra
![Important Math Links Icon]()
Previous to Square of 390
About BrightChamps in United States
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.
