Overview

Grade 1 Math

B2. Operations

9. B2.2 Math Facts

9.6 Subtraction facts up to 20

Subtraction Facts Up to 20

Build quick recall of subtraction facts up to 20 with counting strategies, fact families, and number lines for confident mental math.

What You'll Learn

Identify the minuend, subtrahend, and difference in a subtraction fact such as \( 15 - 7 = 8 \)

Apply the counting back strategy to solve facts like \( 12 - 4 \) by counting down four numbers

Use fact families to connect addition and subtraction, such as \( 6 + 7 = 13 \) and \( 13 - 6 = 7 \)

Recognize the zero rule, since \( n - 0 = n \) for any number \( n \) up to 20

Practice recalling subtraction facts up to 20 quickly to build a foundation for larger subtraction problems

What You'll Practice

Selecting related subtraction facts from addition equations

Solving subtraction problems with minuends up to 20

Matching fact families within 20

Why This Matters

Mastering subtraction facts up to 20 builds the foundation for all future math. Quick recall of these facts helps you solve multi-digit subtraction, word problems, and mental math efficiently in school and everyday situations like handling money or measuring.

This Unit Includes

1 Video lesson

Practice exercises

Learning resources

Skills

Subtraction

Fact Families

Number Sense

Mental Math

Basic Operations

ON Curriculum Aligned