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1st Grade Math
3. 1.OA.B.3
3.2 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
1
Selecting related subtraction facts from addition equations
2
Solving subtraction problems with minuends up to 20
3
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
OH Curriculum Aligned