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Grade 2/Addition

Adding whole tens (4 addends, missing)

Solve 4‑addend tens sums with one missing addend.
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⭐ Easy4
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📊 Medium4
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🔥 Hard4
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Teacher Resources
Teaching Notes

Most challenging in this series. Students must add three numbers mentally, then find the difference. Break into steps: 1) Identify and add the three known numbers, 2) Subtract from total to find missing number, 3) Check by adding all four.

Vocabulary
Missing addend: A number in an addition problem that is unknown.
Total: The sum of all numbers.
Common Mistakes
  • Attempting to add all at once
  • Subtracting wrong numbers
  • Forgetting to verify answer
  • Getting overwhelmed by four numbers
  • Incorrectly summing the known addends
  • Forgetting to subtract the sum of known addends from the total
  • Errors in mental subtraction when finding the missing number
Differentiation
SupportProvide hundreds charts or base ten blocks to visualize adding multiples of ten. Break down the problem into two steps: sum known numbers, then subtract from the total. Work with fewer addends first (2-3).
ChallengeChallenge students to create their own missing addend problems with multiples of ten. Introduce larger sums (e.g., within 1000) or problems with a missing addend in different positions.
Discussion Questions
  • How does knowing your tens facts help you solve these problems?
  • What strategy do you use to find the missing number?
  • How is this problem similar to finding a missing part of a whole?
Extension Activities
  • Find missing addends with hundreds.
  • Use 5 addends.
  • Create your own problems.
Parent Tip

Give your child a total and some parts; ask them to find the missing part.

Learning Path
Skill Cluster

Number Sense & Operations

Estimated Time

15 minutes

Skills Practiced
finding missing addendssubtraction within 1000addition properties
Prerequisites
  • Adding multiples of ten (2-3 addends)
  • Solving for missing addends within 100
  • Understanding the relationship between addition and subtraction
Next Steps
  • Adding two-digit numbers with regrouping
  • Missing addends with two-digit numbers (full range)
  • Solving multi-step addition and subtraction problems