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Because 5 is half of 10, multiplying by 5 is the same as halving and then multiplying by 10. For × 50, halve and multiply by 100. Halving first keeps the numbers small.
✓ You passed this lesson’s test.
Halve first — “5 is half of 10 and 50 is half of 100”
Use it for: ₹5 and ₹50 notes, 50 paise coins, and checking bigger multiplications.
Check: 68 × 100 = 6800, and half of 6800 is 3400 ✓
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 2 min 30 s.
🏅 Sign in with Google to earn the 🐇 Half-Hop Hare 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.
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