Shopping with Money
Money: Shopping with Money
Shopping with Money
Shopping with Money
NCERT anchor
Joyful Mathematics 2 — Give and Take. Buying items and getting change back mirrors the shopkeeper stories in this chapter.
What you'll learn
- To find the total cost of two items by adding their prices.
- To find change by subtracting the cost from the amount paid.
- To solve two-step shopping problems (buy two items, then find change).
Key concepts
Verbal: "Total cost" means add the prices; "change" means subtract cost from money paid.
Symbolic: Change = Amount paid − Total cost. Example: ₹100 − ₹63 = ₹37.
Level 1 — Total cost of two items
A pencil (₹15) and eraser (₹10): total = ₹25.
Level 2 — Finding change
Pay ₹50 for a ₹35 toy: change = 50 − 35 = ₹15.
Level 3 — Two-step: buy two items, then find change
Buy items worth ₹35 and ₹28 (total ₹63), pay ₹100: change = 100 − 63 = ₹37.
Worked example
A book costs ₹42 and a pen costs ₹18. You pay with a ₹100 note. How much change?
Step 1 — Total cost: 42 + 18 = 60
Step 2 — Change: 100 − 60 = 40
Answer: ₹40 change
Common mistakes
| Mistake | Why | Fix |
|---|---|---|
| Finding change before adding both costs | Skipping a step | First add all item costs, then subtract from the amount paid |
| Subtracting the bigger number from the smaller | Order mixed up | Always do amount paid − total cost |
| Forgetting the ₹ symbol | Treating as plain numbers | Always write ₹ in the answer |
Quick check
- A toy costs ₹35 and a ball costs ₹18. Total cost?
- You pay ₹50 for a ₹28 book. Change?
- Two items cost ₹42 and ₹19. You pay ₹100. Change?
Stretch: Buy items worth ₹46 and ₹33, pay with a ₹100 note. Find the change.
Revision tip: Act out a shop at home — add prices first, then find change from play money.
Open the Practice tab for graded questions on Shopping with Money.
Key Takeaways (TL;DR)
- NCERT anchor
- What you'll learn
- Key concepts
- Worked example
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