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1st Grade Math
4. 1.OA.B.4
4.2 Completing subtraction statements up to 20
Completing Subtraction Statements Up to 20
Find the missing number in subtraction statements up to 20 using fact families, related addition, and number line strategies.
What You'll Learn
Identify which part of a subtraction statement is missing, such as \( 15 - \square = 8 \).
Apply the related addition fact \( 8 + \square = 15 \) to find a missing subtrahend.
Use a number line to count forward or backward and check the missing number.
Recognize fact families that connect addition and subtraction facts within 20.
Solve for a missing minuend, subtrahend, or difference using inverse operations.
What You'll Practice
1
Filling in missing minuends in subtraction sentences
2
Finding unknown subtrahends in equations
3
Solving for missing differences in subtraction problems
Why This Matters
Completing subtraction statements builds your number sense and prepares you for solving algebraic equations later. This skill strengthens mental math abilities you'll use daily, from calculating change to measuring ingredients.
This Unit Includes
1 Video lesson
Practice exercises
Learning resources
Skills
Subtraction
Missing Numbers
Inverse Operations
Number Sense
Mental Math
OH Curriculum Aligned