119 LearnersLast updated on June 3rd, 2025
Square of 39
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 39.
What is the Square of 39
The square of a number is the product of the number with itself. The square of 39 is 39 × 39. The square of a number always ends in 0, 1, 4, 5, 6, or 9. We write it in math as 39², where 39 is the base and 2 is the exponent. The square of a positive and a negative number is always positive.
For example, 5² = 25; (-5)² = 25.
The square of 39 is 39 × 39 = 1521.
Square of 39 in exponential form: 39²
Square of 39 in arithmetic form: 39 × 39
How to Calculate the Value of Square of 39
The square of a number is found by multiplying the number by itself. 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 multiply the number by itself to find the square. The product here is the square of the number. Let’s find the square of 39.
Step 1: Identify the number. Here, the number is 39.
Step 2: Multiplying the number by itself, we get, 39 × 39 = 1521.
The square of 39 is 1521.
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 39.
So: 39² = 39 × 39 = 1521
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 39.
Step 1: Enter the number in the calculator. Enter 39 in the calculator.
Step 2: Multiply the number by itself using the multiplication button (×). That is 39 × 39.
Step 3: Press the equal to button to find the answer. Here, the square of 39 is 1521.
Tips and Tricks for the Square of 39
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 39
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 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 when using the formula.
The formula to find the square of the number is a². Instead, students may use 39² with (3 + 9)² or (30 + 9)². So students should check and use the correct formula and double-check the answers to avoid all the confusion.
Mistake 3
Confusing 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 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 39
Problem 1
Find the length of the square, where the area of the square is 1521 cm².
The area of a square = a²
So, the area of a square = 1521 cm²
So, the length = √1521 = 39.
The length of each side = 39 cm
Explanation
The length of a square is 39 cm. Because the area is 1521 cm², the length is √1521 = 39.
Problem 2
Anna is planning to tile her square floor of length 39 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 = 39 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 = 39
Therefore, the area of the floor = 39² = 39 × 39 = 1521.
The cost to tile the floor = 1521 × 5 = 7605.
The total cost = 7605 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 7605 dollars.
Problem 3
Find the area of a circle whose radius is 39 meters.
The area of the circle = 4,780.66 m²
Explanation
The area of a circle = πr²
Here, r = 39
Therefore, the area of the circle = π × 39²
= 3.14 × 39 × 39
= 4780.66 m².
Problem 4
The area of the square is 1521 cm². Find the perimeter of the square.
The perimeter of the square is 156 cm.
Explanation
The area of the square = a²
Here, the area is 1521 cm².
The length of the side is √1521 = 39.
Perimeter of the square = 4a
Here, a = 39
Therefore, the perimeter = 4 × 39 = 156 cm.
Problem 5
Find the square of 40.
The square of 40 is 1600.
Explanation
The square of 40 is multiplying 40 by 40. So, the square = 40 × 40 = 1600.
FAQs on Square of 39
1.What is the square of 39?
2.What is the square root of 39?
3.Is 39 a prime number?
4.What are the first few multiples of 39?
5.What is the square of 38?
Important Glossaries for Square 39
- Perfect square: A number that is the square of an integer. For example, 36 is a perfect square because 6 × 6 = 36.
- Prime number: A number that is only divisible by 1 and itself. For example, 2, 3, 5, 7, 11.
- Exponential form: The way of writing a number as a base raised to a power. For example, 9² where 9 is the base and 2 is the exponent.
- Square root: The value that, when multiplied by itself, gives the original number. For example, the square root of 36 is 6.
- Odd number: An integer not divisible by 2. For example, 1, 3, 5, 7, 9.
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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.
