Times 4: double, double — Maths trick for kids

The trick

Double double — “n × 4 = n doubled, then doubled again”

1. Double the number.
2. Double the answer again.
3. That is the number × 4.

Use it for: Any × 4 sum: legs on animals, wheels on cars, 4 sides of a square, and buying 4 of something.

Worked example: 23 × 4 = 92

✏️ Practice

Work it out in your head or on paper, then tap your answer — or type it and press Check. Stuck? Press “Show me how”.

🏁 Trick 3 test

20 questions. Check each answer, then go to the next one. Get 16 or more right to pass.

🏅 Sign in with Google to earn the ⚡ Double-Double Dynamo badge when you pass — and a certificate when you finish all 5 tricks of Part 1 · Finger & table tricks. You can still take the test without signing in.

🖨️ Multiply by 4 Worksheet

• Worksheet set 1 (PDF)
• Worksheet set 2 (PDF)
• Worksheet set 3 (PDF)