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Fifth/Addition

Adding whole tens (4 addends, missing)

Solve 4‑addend tens sums with one missing addend.
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Prerequisites
Adding whole tens (4 addends)12 WS
30 + 80 + 10 + 20 = ____
What to Do Next
Addition: Add Whole Tens (3 Addends)6 WS
50 + 30 + 20 = ______

Practice Questions

  1. 30 + ? + 10 + 20 = 140
    Show answer

    80

  2. 20 + ? + 30 + 10 = 120
    Show answer

    60

  3. 40 + ? + 20 + 10 = 130
    Show answer

    60

  4. 50 + ? + 10 + 20 = 120
    Show answer

    40

  5. 60 + ? + 10 + 10 = 120
    Show answer

    40

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