Written by Sunny

Modified & Updated: 17 May 2024

Sherman Smith

Reviewed by Sherman Smith

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Subtraction is a fundamental arithmetic operation that involves taking away one quantity from another. Mastering subtraction facts is essential for developing strong math skills. In this article, we will explore the 10 subtraction facts to 20, providing you with the knowledge and techniques to become proficient in subtracting numbers. Whether you are a student, a parent, or an educator, these subtraction facts will lay the foundation for more advanced mathematical concepts.

Table of Contents

Subtraction Basics

Before diving into the 10 subtraction facts, let’s review the basic principles of subtraction. Subtraction is the inverse operation of addition. It involves two numbers: the minuend and the subtrahend. The minuend is the number from which another number is subtracted, while the subtrahend is the number being subtracted. The result is called the difference.

Understanding Number Bonds

Number bonds are a helpful concept when learning subtraction facts. A number bond represents a relationship between numbers, showcasing how they are connected through addition and subtraction. For example, in the number bond 9 = 7 + 2, the numbers 7 and 2 add up to 9. Understanding number bonds can assist in visualizing subtraction facts and solving subtraction problems more efficiently.

Subtraction Facts To 20: 10 – 0 = 10

The subtraction fact 10 – 0 is a great starting point. Subtracting zero from any number yields the same number. Therefore, 10 – 0 equals 10. This fact demonstrates the importance of recognizing that subtracting zero has no effect on the value of a number.

Subtraction Facts To 20: 20 – 10 = 10

The fact 20 – 10 is another essential subtraction fact. Subtracting 10 from 20 leaves us with 10. This fact is significant because it establishes a pattern when subtracting numbers with zero in the ones place.

Subtraction Facts To 20: 10 – 1 = 9

In the subtraction fact 10 – 1, subtracting 1 from 10 gives us 9. This fact helps reinforce the idea that subtracting 1 decreases the value of a number by 1.

Subtraction Facts To 20: 20 – 1 = 19

Subtracting 1 from 20 results in 19. The subtraction fact 20 – 1 is crucial because it highlights the concept of subtracting 1 from a number ending in zero.

Subtraction Facts To 20: 18 – 9 = 9

The subtraction fact 18 – 9 involves subtracting a single-digit number from a number less than 20. Subtracting 9 from 18 leaves us with 9. This fact emphasizes the importance of recognizing patterns and applying subtraction strategies.

Subtraction Facts To 20: 17 – 8 = 9

Similar to the previous fact, the subtraction fact 17 – 8 requires subtracting a single-digit number from a number less than 20. Subtracting 8 from 17 yields 9. Practicing this fact helps build mental math skills.

Subtraction Facts To 20: 15 – 5 = 10

Subtracting 5 from 15 gives us 10. The fact 15 – 5 showcases the relationship between numbers ending in 5 and 0. Recognizing this pattern can simplify subtraction calculations.

Subtraction Facts To 20: 12 – 3 = 9

The subtraction fact 12 – 3 involves subtracting a single-digit number from a number less than 20. Subtracting 3 from 12 equals 9. This fact emphasizes the importance of understanding the subtraction process and applying it accurately.

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By mastering these 10 subtraction facts to 20, you will develop a strong foundation in subtraction, enabling you to tackle more complex mathematical problems with confidence.


Subtraction is a vital skill that forms the basis for various mathematical concepts. By understanding the 10 subtraction facts to 20, you can enhance your mental math abilities and improve your overall mathematical fluency. Remember to practice regularly and employ strategies such as number bonds and recognizing patterns to simplify the subtraction process.

Frequently Asked Questions (FAQs)

How can I help my child learn subtraction facts to 20?

Encourage your child to practice regularly with flashcards, number lines, and real-life examples. Make learning fun by using games and interactive activities.

Are there any shortcuts or tricks for memorizing subtraction facts?

Yes! Utilize number bonds and patterns to help remember the facts. For example, recognizing that subtracting zero does not change a number’s value can be a helpful shortcut.

What if my child is struggling with subtraction facts?

Offer support and patience. Break down the facts into smaller groups and focus on one fact at a time. Provide visual aids and hands-on activities to reinforce understanding.

How can I make subtraction facts more engaging for my students?

Incorporate manipulatives, such as blocks or counters, to make subtraction tangible. Use relatable word problems and real-life examples to make the concept meaningful and relatable.

Why are subtraction facts important to learn?

Subtraction facts are fundamental for building a strong math foundation. They enhance problem-solving skills, mental math abilities, and provide a basis for advanced math concepts.

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