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1st Grade Math
3. 1.OA.B.3
3.3 Verifying subtraction statements
Verifying Subtraction Statements
Find out how to tell if a subtraction statement is true or false using addition checks and number lines, with easy steps for facts up to 20.
What You'll Learn
Check a subtraction statement by turning it into its related addition fact, since \( a - b = c \) is true only if \( c + b = a \)
Use a number line to jump backward from the first number and see if you land on the given answer
Identify a false subtraction statement by finding the correct difference and comparing it to the one given
Apply counting up as another way to double check a subtraction fact quickly
Recognize that verifying works the same way even when zero is part of the statement
What You'll Practice
1
Judging true or false for subtraction equations
2
Verifying subtraction statements with single and multi-digit numbers
3
Identifying errors in subtraction expressions
Why This Matters
Verifying subtraction statements builds your number sense and critical thinking skills. This ability to check whether math statements are correct helps you catch errors in your own work and prepares you for solving equations and inequalities in algebra.
This Unit Includes
1 Video lesson
Practice exercises
Learning resources
Skills
Subtraction
Number Sense
Verification
True or False
Mathematical Reasoning
OH Curriculum Aligned