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15 × n is 10 × n plus half of that again, because 5 is half of 10. 16 × n is 10 × n + 6 × n, or the 8 table doubled.
✓ You passed this lesson’s test.
Ten and a bit — “15 × n = 10 × n + 5 × n”
Use it for: 15 minutes (a quarter hour), and the Module 3 doubling tricks.
Check: 15 × 8 = 30 × 4 = 120 ✓
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.
🏅 Sign in with Google to earn the 🐯 Tiger Fifteens badge when you pass — and a certificate when you finish all 6 lessons of Module 2 · Tables 11–20. You can still take the test without signing in.
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