Multiply by 4 "Double the Double" strategy practice quiz for kids.

📚 Topic Summary

The 'Double the Double' strategy is a simple way to multiply a number by 4. Instead of directly multiplying by 4, you first double the number, and then double the result again. It's like doing two easy steps instead of one harder one! For example, to find $3 \times 4$, you first double 3 to get 6, and then double 6 to get 12. So, $3 \times 4 = 12$.

This method works because multiplying by 4 is the same as multiplying by 2 twice: $4 = 2 \times 2$. This strategy can make mental math much faster and easier, especially when dealing with larger numbers. Let's get started!

🔤 Part A: Vocabulary

• ➕ Double: To multiply a number by 2.
• 🔢 Multiply: To increase a number by a certain factor.
• ➗ Divide: To split a number into equal parts.
• 🧮 Factor: A number that divides evenly into another number.
• 💯 Product: The result of multiplying two numbers.

✍️ Part B: Fill in the Blanks

To multiply by 4 using the 'Double the Double' strategy, you first ________ the number. Then, you ________ the result. For example, to find $5 \times 4$, you first double 5 to get ________, and then double ________ to get ________. So, $5 \times 4 = $________.

🤔 Part C: Critical Thinking

Explain in your own words why the 'Double the Double' strategy works for multiplying by 4.