Maths Olympiad · topic 4 of 33 · free

Money and change — Maths Olympiad practice

Shopping questions are about two steps: add up what you buy, then take that away from the note you pay with. The trap options are the total itself, or the change for just one thing.

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How to solve it

Total, then take away — “change = money given − total cost”

  1. Add up the cost of everything you buy (or multiply for many of the same thing).
  2. Change = the note you pay with − the total cost.
  3. Check: change + total cost should give back the note.

Use it for: Money questions in Class 2–4 papers, and real shopping.

Worked example: A pencil box costs ₹38 and a pen costs ₹25. You pay for both with a ₹100 note. How much change do you get? ₹37

  1. Total cost: ₹38 + ₹25 = ₹63.
  2. Change: ₹100 − ₹63 = ₹37.

Check: ₹37 + ₹63 = ₹100 ✓

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

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