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Number problems hide simple patterns. Consecutive numbers are spaced evenly, so the middle one is the average. Two numbers from their sum and difference come straight out. Swapping the digits of a two-digit number changes it by 9 × the difference of the digits.
✓ You passed this lesson’s test.
Use the structure — “consecutive numbers share a middle; sum and difference give both numbers; swapping digits changes by 9 × the gap”
Use it for: Number puzzles in aptitude, Olympiad and scholarship tests, and early algebra.
Check: 74 − 47 = 27 and 4 + 7 = 11 ✓
▶ Watch it animatedWork 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 🔢 Number Puzzler badge when you pass — and a certificate when you finish all 10 lessons of Part 3 · Aptitude challenge. 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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