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Fourth/Multiplication

Missing Factors: Two and Multiples of Ten

Find the missing factor in multiplication facts with 2 and multiples of ten — early algebra thinking.
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Study Guide

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Practice Questions

  1. ? x 90 = 180
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    2

  2. 2 x ? = 140
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    70

  3. 2 x 50 = ?
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    100

  4. ? x 30 = 60
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    2

  5. 2 x ? = 20
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    10

Teacher Resources
Standards
3.OA.A.1
Printable Aids
Multiplication ChartSkip Counting Number Line
Teaching Notes

Focus on fluency and pattern recognition. Encourage students to visualize groups or use repeated addition strategies. Accuracy should come before speed.

Vocabulary
Factor: A number that divides another number exactly.
Product: The result of multiplication.
Common Mistakes
  • Confusing operation symbols (+ vs x)
  • Skip-counting errors
  • Confusing finding the missing factor with finding the product.
  • Incorrectly applying doubles facts or skip counting strategies.
  • Not recognizing the inverse relationship between multiplication and division.
Differentiation
SupportProvide manipulatives or a number line.
ChallengeChallenge students to create word problems for the equations.
Discussion Questions
  • What strategy did you use?
  • Which problem was easiest?
  • How can you use division to find the missing number?
  • What mental math strategy helps you solve these quickly?
  • How is this problem related to counting by tens?
  • Can you explain your strategy to a partner?
Extension Activities
  • Create flashcards.
  • Peer teaching.
Parent Tip

Ask your child to find missing numbers in everyday multiplication facts.

Learning Path
Skill Cluster

Multiplication and Division

Estimated Time

15 minutes

Skills Practiced
Basic multiplication