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Doubling is the fastest thing you can do in your head. Since 4 is 2 × 2 and 8 is 2 × 2 × 2, any number × 4 or × 8 is just a quick run of doubles.
✓ You passed this lesson’s test.
Double up — “4 = 2 × 2 and 8 = 2 × 2 × 2”
Use it for: Packs of 4 or 8, perimeters of squares, and the 16 and 32 times tables.
Check: 37 × 8 = 30 × 8 + 7 × 8 = 240 + 56 = 296 ✓
Work it out in your head or on paper, type the answer and press Check. Stuck? Press “Show me how”.
Right: 0 · Tried: 0
20 questions. Check each answer, then go to the next one. Get 16 or more right to pass — and beat the clock: finish within 3 min.
🏅 Sign in with Google to earn the 🚀 Rocket Multiplier badge when you pass — and a certificate when you finish all 5 lessons of Part 2 · Speed multiplying. You can still take the test without signing in.
Why does it work? When should you use it? Ask in English, मराठी or हिंदी.
Sign in with Google to ask Free — 20 questions a day.
Prefer a real teacher? TalentJR teachers take live online classes anywhere in India and visit homes in selected cities. Tell us what you need and our team will call you with timings and fees.