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3rd Grade Math
11. 3.NBT.A.2
11.5 Identifying the Missing Digits (Addition)
Identifying the Missing Digits in Addition
Discover how to use place value and column addition to fill in a missing digit in an addition problem, including problems that need regrouping.
What You'll Learn
Identify each missing digit by working one place value column at a time, starting with the ones.
Apply inverse subtraction, such as \( 13 - 7 = 6 \), to uncover an unknown digit in a column.
Recognize when a column total is 10 or more so a 1 carries into the next place value.
Compare digits by place value (ones, tens, hundreds) before deciding which one is missing.
Check your answer by adding the two completed numbers back together to confirm the given sum.
What You'll Practice
1
Finding missing digits in addition problems up to 1000
2
Solving addition equations with blanks in different place values
3
Determining unknown numbers in ones, tens, and hundreds places
Why This Matters
Finding missing digits strengthens your number sense and problem-solving skills, which are essential for algebra and real-world situations like checking receipts, balancing budgets, or catching calculation errors in everyday math.
This Unit Includes
1 Video lesson
Practice exercises
Learning resources
Skills
Addition
Place Value
Mental Math
Problem Solving
Number Sense
Logical Reasoning
OH Curriculum Aligned