TalentJR apps
The digits of every number in the 9 times table add up to a number in the 9 table: 72 → 7 + 2 = 9, 315 → 3 + 1 + 5 = 9, 7623 → 18. A magician uses this to find a digit a friend has hidden.
✓ You passed this trick’s test.
Digits add to the 9 table — “the digits of any 9-table number add up to 9, 18, 27 …”
Use it for: Mind-reading tricks, checking answers in the 9 table, and divisibility by 9.
Check: 315 ÷ 9 = 35 ✓
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 ✨ Digit Sum Sorcerer badge when you pass — and a certificate when you finish all 5 tricks of Part 2 · Number magic. 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.