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4 is 2 × 2 and 8 is 2 × 2 × 2. So you never need the 4 or 8 table for big numbers — just keep doubling.
✓ You passed this lesson’s test.
Double, double, double — “× 4 is two doubles, × 8 is three”
Use it for: Packs of 4 or 8, legs of animals, and bigger sums like 35 × 8.
Check: 23 × 8 = 20 × 8 + 3 × 8 = 160 + 24 = 184 ✓
Work it out in your head or on paper, type the answer and press Check. Stuck? Press “Show me how”.
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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 🐙 Octo Doubler badge when you pass — and a certificate when you finish all 6 lessons of Part 2 · Mental multiplication & division. You can still take the test without signing in.
Why does it work? When should you use it? Ask in English, मराठी or हिंदी.
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