Shark Learning
Grade 2/Addition

Missing 2-Digit Addend: Column Addition (227)

Find the missing 2-digit addend that completes the sum.
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Quick Tip
Use total - known addend; check by adding back.
Teacher Resources
Teaching Notes

This collection focuses on using the inverse relationship between addition and subtraction to find missing 2-digit addends. Emphasize place value alignment and regrouping during subtraction.

Vocabulary
Addend: A number used in addition.
Missing Addend: The unknown number in an addition equation.
Sum: The answer when numbers are added together.
Common Mistakes
  • Forgetting to regroup when subtracting to find the missing addend.
  • Misaligning digits in columns, leading to incorrect place value calculations.
  • Incorrectly performing basic subtraction facts when finding the difference.
Differentiation
SupportProvide manipulatives (e.g., base-ten blocks) to model the subtraction process. Use smaller 2-digit numbers initially (no regrouping).
ChallengeIntroduce problems with three addends or missing addends in word problems. Challenge with larger numbers or different column formats.
Discussion Questions
  • How can knowing subtraction help us solve addition problems with a missing number?
  • Why is it important to line up the tens and ones places when adding or subtracting columns?
  • Can you explain how to check your answer after finding the missing addend?
Extension Activities
  • Use number bonds.
  • Create missing addend problems.
  • Use a number line to solve.
Parent Tip

Use money: 'You need $56. You have $34. How much more money do you need?'

Learning Path
Skill Cluster

Number Operations & Algebraic Thinking

Estimated Time

15 minutes

Skills Practiced
missing addend 2 digitsubtraction as inverse additionmulti digit addition
Prerequisites
  • Adding two 2-digit numbers in columns (with and without regrouping)
  • Subtracting two 2-digit numbers in columns (with and without regrouping)
  • Understanding the relationship between addition and subtraction
Next Steps
  • Adding three 2-digit numbers in columns
  • Finding missing addends with 3-digit numbers
  • Solving 2-digit missing addend word problems
  • Add two 2-digit numbers in columns
  • Subtract two 2-digit numbers in columns
  • Missing Addends (3-Digit Numbers)