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Last updated on June 30th, 2025

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Square 10 to 20

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A square of a number is the multiplication of a number ‘N’ by itself. Square numbers are used practically in situations like finding the area of a garden or measuring distance on maps. In this topic, we are going to learn about the square numbers from 10 to 20.

Square 10 to 20 for US Students
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Square 10 to 20

Numbers 10 to 20, when squared, give values ranging from 100 to 400. Squaring numbers can be useful for solving complex math problems. For example, squaring the number 15 implies multiplying the number twice. So that means 15 × 15 = 225. So let us look into the square numbers from 10 to 20.

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Square Numbers 10 to 20 Chart

Learning square numbers helps us find the area of two-dimensional shapes like squares. Let’s take a look at the chart of square numbers 10 to 20 given below. Understanding these values helps in various math concepts like measuring areas and so on. Let’s dive into the chart of squares.

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List of All Squares 10 to 20

We will be listing the squares of numbers from 10 to 20. Squares are an interesting part of math that help us solve various problems easily. Let’s take a look at the complete list of squares from 10 to 20. Square 10 to 20 — Even Numbers Square numbers that are divisible by 2 are even. The square of any even number will result in an even number. Let’s look at the even numbers in the squares of 10 to 20. Square 10 to 20 — Odd Numbers When you multiply an odd number by itself, the result is also an odd number. When we square an odd number the result will always be odd. Let’s look at the odd numbers in the squares of 10 to 20. How to Calculate Squares From 10 to 20 The square of a number is written as N², which means multiplying the number N by itself. We use the formula given below to find the square of any number: N² = N × N Let’s explore two methods to calculate squares: the multiplication method and the expansion method: Multiplication method: In this method, we multiply the given number by itself to find the square of the number. Take the given number, for example, let’s take 12 as N. Multiply the number by itself: N² = 12 × 12 = 144 So, the square of 12 is 144. You can repeat the process for all numbers from 10 to 20. Expansion method: In this method, we use algebraic formulas to break down the numbers for calculating easily. We use this method for larger numbers. Using the formula: (a + b)² = a² + 2ab + b² For example: Find the square of 19. 19² = (20 - 1)² To expand this, we use the algebraic identity (a - b)² = a² - 2ab + b². Here, a = 20 and b = 1. = 20² - 2 × 20 × 1 + 1² 20² = 400; 2 × 20 × 1 = 40; 1² = 1 Now, adding them together: 400 - 40 + 1 = 361 So, the square of 19 is 361.

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Rules for Calculating Squares 10 to 20

When learning how to calculate squares, there are a few rules that we need to follow. These rules will help guide you through the process of calculating squares. Rule 1: Multiplication Rule The basic rule of squaring a number is to multiply the number by itself. We use the formula given below, to find the square of numbers: N² = N × N For example, 18² = 18 × 18 = 324. Rule 2: Addition of progressive squares In the addition of progressive squares, we calculate square numbers by adding consecutive odd numbers. For example, 10² = 100 → 1 + 3 + ... + 19 + 21 + 23 = 100 11² = 121 → 1 + 3 + ... + 21 + 23 = 121 12² = 144 → 1 + 3 + ... + 23 + 25 = 144 Rule 3: Estimation for large numbers For larger numbers, round them to the nearest simple number, then adjust the value. For example, To square 18, round it to 20 and adjust: 20² = 400, then subtract the correction factor 400 - (2 × 20 × 2) + 2² 400 - 80 + 4 = 324 Thus, 18² = 324.

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Tips and Tricks for Squares 10 to 20

To make learning squares easier for kids, here are a few tips and tricks that can help you quickly find the squares of numbers from 10 to 20. These tricks will help you understand squares easily. Square numbers follow a pattern in unit place Square numbers end with these numbers in the one digit 0, 1, 4, 5, 6, or 9. If the last digit of a number is 2, 3, 7, or 8, it cannot be a square number. For example, 121 is a square number that ends with 1, while 144 is also a square number that ends with 4. Even or Odd property The square of an even number will always be even, and the square of an odd number will always be odd. For example, the square of 12 is 144 which is even. And the square of 13 is 169 which is odd. Adding odd numbers Square numbers can be calculated by adding the odd numbers one after the other. For example, 10² = 100 → 1 + 3 + ... + 19 + 21 + 23 = 100 11² = 121 → 1 + 3 + ... + 21 + 23 = 121 12² = 144 → 1 + 3 + ... + 23 + 25 = 144

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Common Mistakes and How to Avoid Them in Squares 10 to 20

When learning about squares, it’s natural to make some mistakes along the way. Let’s explore some common mistakes children often make and how you can avoid them. This will help get a better understanding of squares.

Mistake 1

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Confusing squaring as doubling

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Children think that squaring a number is the same as doubling it. For example, 14² is 196, not 28. Always remember that squaring means multiplying the number by itself.

Mistake 2

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Confusing square and square root

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Kids assume that squaring and square rooting are the same. For example, they might think that √81 equals 81², whereas they are not. Squaring increases the value, while the square root finds the original number.

Mistake 3

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Improperly squaring a negative number

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Kids assume that the square of a negative number is negative. For example, instead of writing (-11)² as 121, they write it as -121. Always remember that the square of a negative number is positive.

Mistake 4

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Assuming all composite numbers as perfect squares

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Kids assume that all composite numbers are perfect squares. For example, numbers like 14, 15, and 18 are composite but not perfect squares.

Mistake 5

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Using the wrong formula for squares

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Students sometimes apply incorrect formulas. For example, the formula for squares is N², meaning N × N, but they confuse it with 2N, which is multiplying the number N with 2, not squaring it. We must make sure we understand the difference and apply the correct formula.

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Square 10 to 20 Examples

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Problem 1

Find the square of 17.

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The square of 17 is 289. 17² = 17 × 17 = 289

Explanation

We can break down 17 × 17 as: 17 × 17 = (20 - 3) × (20 - 3) To expand this, we use the algebraic identity (a - b)² = a² - 2ab + b². Here, a = 20 and b = 3. = 20² - 2 × 20 × 3 + 3² 20² = 400; 2 × 20 × 3 = 120; 3² = 9 Now, adding them together: 400 - 120 + 9 = 289 So, the square of 17 is 289.

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Problem 2

Find the square of 14.

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The square of 14 is 196. 14² = 14 × 14 = 196

Explanation

We can break down 14 × 14 as: 14 × 14 = (10 + 4) × (10 + 4) To expand this, we use the algebraic identity (a + b)² = a² + 2ab + b². Here, a = 10 and b = 4. = 10² + 2 × 10 × 4 + 4² 10² = 100; 2 × 10 × 4 = 80; 4² = 16 Now, adding them together: 100 + 80 + 16 = 196 So, the square of 14 is 196.

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Problem 3

Find the square of 20.

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The square of 20 is 400. 20² = 20 × 20 = 400

Explanation

Since 20 × 20 is a simple multiplication, we directly get the answer: 20 × 20 = 400. Thus, the square of 20 is 400.

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Problem 4

Observe the pattern in square numbers: 10², 11², 12²,… 20². Find the pattern in their differences.

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The differences follow an odd-number sequence: 21, 23, 25, 27, … This shows that square numbers increase by consecutive odd numbers.

Explanation

Calculating the squares: 100, 121, 144, 169, 196, 225, 256, 289, 324, 361, 400 Now, finding the differences: 121 − 100 = 21, 144 − 121 = 23, 169 − 144 = 25, 196 − 169 = 27,…

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Problem 5

Is 15 a perfect square?

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15 is not a perfect square.

Explanation

Perfect squares are numbers that result from squaring whole numbers. If a number lies between two square values, it is not a perfect square. Find the closest squares: 3² = 9, 4² = 16 Since 15 is not equal to any square of a whole number, it is not a perfect square.

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FAQs on Squares 10 to 20

1.What are the odd perfect square numbers from 10 to 20?

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2.Are all square numbers positive?

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3.What is the sum of the perfect squares from 10 to 20?

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4.What is the square of 15?

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5.Are all prime numbers perfect squares?

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6.How does learning Algebra help students in United States make better decisions in daily life?

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7.How can cultural or local activities in United States support learning Algebra topics such as Square 10 to 20?

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8.How do technology and digital tools in United States support learning Algebra and Square 10 to 20?

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9.Does learning Algebra support future career opportunities for students in United States?

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Important Glossaries for Squares 10 to 20

Odd square number: A square number that we get from squaring an odd number. For example, 11² is 121, which is an odd number. Even square number: A square number that we get from squaring an even number. For example, 12² is 144, which is an even number. Perfect square: A number that can be expressed as a product of a number when multiplied by itself. For example, 16 is a perfect square as 4 × 4 = 16. Multiplication method: A method to calculate the square of a number by multiplying the number by itself. Expansion method: A method using algebraic identities to simplify and calculate the square of a number, especially useful for larger numbers.

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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.

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Fun Fact

: He loves to play the quiz with kids through algebra to make kids love it.

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