Doubling Multiples of Ten (298)

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. **Instruction Tips:** These worksheets focus on multiplying whole tens by 2, helping students develop fluency and recognize patterns in multiplication. **Worked Example:** 2 x 70 worked example **Problem:** 2 x 70 **Strategy:** Think of doubling the number: 70 + 70 = 140. **Hints:** - Use repeated addition to find the answer. **Steps:** - Multiply 2 by 70 to get the answer.

Vocabulary

Multiple: The result of multiplying a number.

Product: The answer to a multiplication problem.

Common Mistakes

• Confusing operation symbols (+ vs x)
• Skip-counting errors
• Forgetting to include the zero in the product (e.g., 2 x 30 = 6).
• Confusing addition with multiplication (e.g., 2 + 30 instead of 2 x 30).
• Incorrect basic doubling facts (e.g., 2 x 7 = 12, affecting 2 x 70).

Differentiation

Discussion Questions

• What strategy did you use?
• Which problem was easiest?
• How is multiplying by 20 like multiplying by 2?
• What pattern do you notice when multiplying any whole ten by 2?
• Can you explain why 2 x 40 equals 80?
• How can knowing 2 x 5 help you find 2 x 50?

Extension Activities

• Create flashcards.
• Peer teaching.

Parent Tip

Ask your child to double numbers like 20, 40, or 60.

Skill Cluster

Multiplication & Place Value

Estimated Time

15 minutes

Skills Practiced

Prerequisites

• Skip Counting by 10s
• Doubling Small Numbers
• Place Value: Tens

Next Steps

• Multiplying One-Digit by Multiples of Ten
• Multiplication Fact Fluency
• Three times whole tens
• Multiply by 10 and 100
• Fact Fluency: Multiplying by 2