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Grade 1/Addition

Missing Addend: 2-Digit + 1-Digit Column Addition (Grade 2) (226)

Find the missing 1-digit addend that completes the sum.
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Quick Tip
Compute total - known addend to get missing number.
Teacher Resources
Teaching Notes

This collection helps students understand the relationship between addition and subtraction by finding a missing addend. Encourage students to 'think addition' or use inverse operations to solve. Emphasize place value when working with columns.

Vocabulary
Addend: A number that is added to another.
Missing Addend: The unknown number in an addition problem.
Sum: The answer to an addition problem.
Common Mistakes
  • Confusing the roles of addends and sum.
  • Miscalculating basic addition/subtraction facts required to find the missing part.
  • Not recognizing the 'missing part' as a subtraction problem in disguise.
Differentiation
SupportUse manipulatives (like base ten blocks) to model the known addend and the sum, then have them count to find the missing part. Provide a number line for visual support.
ChallengeChallenge students to explain their strategy for finding the missing addend. Introduce problems with missing addends in different positions or problems that require carrying over within the 'missing addend' calculation.
Discussion Questions
  • How can knowing addition facts help you find a missing number?
  • If you know the sum and one addend, what operation can you use to find the other addend?
  • How is this problem like a puzzle?
Extension Activities
  • Use number bonds.
  • Create missing addend problems.
  • Use a number line to solve.
Parent Tip

Use objects: 'I have 5 apples, and now I have 8. How many did I get?'

Learning Path
Skill Cluster

Number Operations & Algebraic Thinking

Estimated Time

15 minutes

Skills Practiced
missing addend within 100subtraction as inverse additionfact families
Prerequisites
  • Adding 2-digit and 1-digit numbers without regrouping
  • Basic addition and subtraction facts within 20
  • Understanding place value (tens and ones)
Next Steps
  • Missing addend: 2-digit + 2-digit numbers
  • Missing subtrahend/minuend problems
  • Word problems involving missing addends
  • Add a 2-digit and a 1-digit number in columns
  • Add a 2-digit and a 2-digit number in columns - missing addend
  • Subtract 1-digit from a 2-digit number - missing subtrahend