marilyn110
marilyn110 6d ago • 20 views

Real-World Examples: Multiplying by 8 Using Double the Four (Grade 3 Math)

Hey there! 👋 Let's learn how to multiply by 8 using a cool trick called 'Double the Four'. It's like a math shortcut! I'll show you how to easily solve these problems. Plus, there's a quiz to test your skills. Ready to get started? 🤓
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carolyn.brown Jan 7, 2026

📚 Multiplying by 8 Using Double the Four: A Quick Study Guide

  • 🔢 Multiplying by 8 can be thought of as doubling the result of multiplying by 4.
  • ➕ "Double the Four" means we multiply a number by 4, and then multiply the result by 2.
  • 💡 This works because $8 = 4 \times 2$.
  • 📝 Example: To find $6 \times 8$, we can do $(6 \times 4) \times 2$.
  • 🧮 Knowing your multiplication facts for 4 makes this method easier.
  • 🧠 This strategy simplifies multiplication by breaking it into smaller, more manageable steps.

Practice Quiz

  1. What is $3 \times 8$ using the 'double the four' method?
    1. 6
    2. 12
    3. 24
    4. 32
  2. Calculate $5 \times 8$ using the 'double the four' strategy.
    1. 10
    2. 20
    3. 30
    4. 40
  3. What is the value of $7 \times 8$ if you double the result of $7 \times 4$?
    1. 14
    2. 28
    3. 42
    4. 56
  4. Find the product of $2 \times 8$ using the 'double the four' approach.
    1. 4
    2. 8
    3. 16
    4. 24
  5. If $4 \times 4 = 16$, what is $4 \times 8$ using the 'double the four' method?
    1. 8
    2. 16
    3. 24
    4. 32
  6. What is $9 \times 8$ using the doubling strategy with multiplying by 4?
    1. 36
    2. 54
    3. 72
    4. 81
  7. Compute $6 \times 8$ by doubling the result of $6 \times 4$.
    1. 24
    2. 36
    3. 48
    4. 54
Click to see Answers
  1. C
  2. D
  3. D
  4. C
  5. D
  6. C
  7. C
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dawn.rivera Jan 7, 2026

📚 Quick Study Guide

  • 🔢 Multiplying by 8 can be simplified by doubling the result of multiplying by 4.
  • ➕ This method breaks down the multiplication into smaller, easier steps.
  • 💡 The formula: $8 \times n = 4 \times n \times 2$
  • 📝 Example: $8 \times 3 = (4 \times 3) \times 2 = 12 \times 2 = 24$

Practice Quiz

  1. What is $8 \times 2$ using the 'Double the Four' method?

    1. 4
    2. 8
    3. 16
    4. 24

  2. Calculate $8 \times 5$ using the 'Double the Four' method.

    1. 20
    2. 30
    3. 40
    4. 50

  3. What is $8 \times 4$ using the 'Double the Four' method?

    1. 16
    2. 24
    3. 32
    4. 40

  4. Solve $8 \times 6$ using the 'Double the Four' method.

    1. 36
    2. 48
    3. 56
    4. 64

  5. What is $8 \times 7$ using the 'Double the Four' method?

    1. 42
    2. 49
    3. 56
    4. 63

  6. Calculate $8 \times 9$ using the 'Double the Four' method.

    1. 63
    2. 72
    3. 81
    4. 90

  7. What is $8 \times 10$ using the 'Double the Four' method?

    1. 60
    2. 70
    3. 80
    4. 90
Click to see Answers
  1. C
  2. C
  3. C
  4. B
  5. C
  6. B
  7. C

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