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Missing Factor: Multiply Whole Tens

Find the missing factor in multiplication problems with whole tens.
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Study Guide

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Practice Questions

  1. 80 × ? = 6,400
    Show answer

    80

  2. ? × 30 = 1,200
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    40

  3. 50 × ? = 2,000
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    40

  4. ? × 60 = 3,600
    Show answer

    60

  5. 20 × ? = 1,400
    Show answer

    70

Teacher Resources
Standards
3.NBT.A.3
Printable Aids
Place Value ChartBase Ten Blocks
Teaching Notes

Emphasize using inverse operations (division) to find the missing factor. Relate problems to place value understanding for multiplying by tens.

Vocabulary
Factor: A number you multiply.
Missing Factor: The unknown number in a multiplication problem.
Common Mistakes
  • Forgetting to account for the zero in multiples of ten.
  • Incorrectly applying basic multiplication facts.
  • Confusing the missing factor with the product.
Differentiation
SupportUse arrays or base-ten blocks to visualize the multiplication.
ChallengeIntroduce two-digit missing factors or larger multiples of ten.
Discussion Questions
  • How does knowing 6 x 3 help you solve 6 x __ = 180?
  • What strategies can you use to find a missing factor quickly?
  • Can you think of a real-world problem where you would need to find a missing factor?
  • How is finding a missing factor related to division?
Extension Activities
  • Create missing factor word problems.
  • Use a calculator to check answers.
  • Play a missing factor game.
Parent Tip

Ask your child to find the missing price for multiple items.

Learning Path
Skill Cluster

Number Sense & Operations

Grade Level

3-4

Skills Practiced
Missing factor multiplicationMultiplication by tensPlace value zeros