118 LearnersLast updated on May 26th, 2025
Square of 90
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 90.
What is the Square of 90
The square of a number is the product of the number itself. The square of 90 is 90 × 90. The square of a number always ends in 0, 1, 4, 5, 6, or 9. We write it in math as 90², where 90 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 90 is 90 × 90 = 8100. Square of 90 in exponential form: 90² Square of 90 in arithmetic form: 90 × 90
How to Calculate the Value of Square of 90
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 90 Step 1: Identify the number. Here, the number is 90 Step 2: Multiplying the number by itself, we get, 90 × 90 = 8100. The square of 90 is 8100.
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 90 So: 90² = 90 × 90 = 8100
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 90. Step 1: Enter the number in the calculator Enter 90 in the calculator. Step 2: Multiply the number by itself using the multiplication button (×) That is 90 × 90 Step 3: Press the equal to button to find the answer Here, the square of 90 is 8100. Tips and Tricks for the Square of 90 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 90
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.
Mistake 2
Errors will be using the formula.
The formula to find the square of the number is a². Instead, students may use 90² with (9 + 0)² or (80 + 10)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 do the operations in the correct order to avoid error.
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 90
Problem 1
Find the length of the square, where the area of the square is 8100 cm².
The area of a square = a² So, the area of a square = 8100 cm² So, the length = √8100 = 90. The length of each side = 90 cm
Explanation
The length of a square is 90 cm. Because the area is 8100 cm² the length is √8100 = 90.
Problem 2
Sarah is planning to tile her square kitchen floor of length 90 feet. The cost to tile a foot is 2 dollars. Then how much will it cost to tile the full floor?
The length of the floor = 90 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 = 90 Therefore, the area of the floor = 90² = 90 × 90 = 8100. The cost to tile the floor = 8100 × 2 = 16200. The total cost = 16200 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 16200 dollars.
Problem 3
Find the area of a circle whose radius is 90 meters.
The area of the circle = 25434 m²
Explanation
The area of a circle = πr² Here, r = 90 Therefore, the area of the circle = π × 90² = 3.14 × 90 × 90 = 25434 m².
Problem 4
The area of the square is 8100 cm². Find the perimeter of the square.
The perimeter of the square is 360 cm
Explanation
The area of the square = a² Here, the area is 8100 cm² The length of the side is √8100 = 90 Perimeter of the square = 4a Here, a = 90 Therefore, the perimeter = 4 × 90 = 360.
Problem 5
Find the square of 91.
The square of 91 is 8281
Explanation
The square of 91 is multiplying 91 by 91. So, the square = 91 × 91 = 8281
FAQs on Square of 90
1.What is the square of 90?
2.What is the square root of 90?
3.Is 90 a prime number?
4.What are the first few multiples of 90?
5.What is the square of 91?
6.How does learning Algebra help students in Thailand make better decisions in daily life?
7.How can cultural or local activities in Thailand support learning Algebra topics such as Square of 90?
8.How do technology and digital tools in Thailand support learning Algebra and Square of 90?
9.Does learning Algebra support future career opportunities for students in Thailand?
Important Glossaries for Square 90.
Perfect square: A number that is the square of an integer. For example, 8100 is a perfect square because it is 90². Exponent: The number that indicates how many times the base is multiplied by itself. For example, in 90², 2 is the exponent. Square root: The square root of a number is a value that, when multiplied by itself, gives the original number. For example, √8100 = 90. Area: The amount of space inside the boundary of a flat (2-dimensional) object such as a triangle or circle. Perimeter: The total distance around the edge of a two-dimensional shape. For example, the perimeter of a square is 4 times the length of one side.
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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.
