Maths tricks · trick 14 of 25 · free

Age and coin puzzles — Maths trick for kids

Age and coin riddles look tricky but break into small steps. Ages: everyone gets older by the same number of years. Coins: pretend every coin is the smaller coin, then see how much extra money there is.

▶ Watch how it works

Got it? Practise ↓

The trick

Pretend and adjust — “pretend every coin is ₹1, then each ₹2 coin adds ₹1 extra”

  1. Ages: find each age now, then add (later) or take away (earlier) the same years for everyone.
  2. Coins: pretend all coins are ₹1; the extra money tells you how many ₹2 coins there are.
  3. Check your answer by putting it back into the riddle.

Use it for: Maths riddles, reasoning and Olympiad tests, and real-life money counting.

Worked example: You have 10 coins. Each coin is ₹1 or ₹2, and together they make ₹14. How many ₹2 coins do you have? → 4

  1. If all 10 coins were ₹1, they would make ₹10.
  2. You have ₹14 − ₹10 = ₹4 extra.
  3. Each ₹2 coin adds ₹1 extra, so there are 4 coins of ₹2.

Check: 4 × ₹2 + 6 × ₹1 = ₹8 + ₹6 = ₹14 ✓

▶ Watch it animated

✓ Written and checked by the TalentJR team · Updated 13 Oct 2026 · How we make our lessons

✏️ Practice

Work it out in your head or on paper, then tap your answer — or type it and press Check. Stuck? Press “Show me how”.

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🏁 Trick 14 test

20 questions. Check each answer, then go to the next one. Get 16 or more right to pass.

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🖨️ Age and Coin Puzzles Worksheet

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