Missing Factors: Two and Multiples of Ten (299)

Standards

Printable Aids

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

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.

Skill Cluster

Multiplication and Division

Estimated Time

15 minutes

Skills Practiced

Prerequisites

• Multiplication facts for 2
• Counting by 10s
• Understanding doubles
• Basic division concept

Next Steps

• Missing factors for other numbers (e.g., 3, 5)
• Division with multiples of 10
• Multi-step multiplication problems
• Three Times Whole Tens, Missing Factor
• Dividing Multiples of Ten by Two
• Missing Factors up to 100