Money
Measurement, Money & Data: Money
Money
Money — Rupees and Paise
What you'll learn
- That 100 paise = ₹1, and money amounts can be added and subtracted like whole numbers.
- To find the total cost of buying more than one item.
- To calculate change received after paying with a note of higher value.
Key concepts
Level 1 — Core idea
Verbal: If a pencil costs ₹8 and an eraser costs ₹5, buying both costs ₹8 + ₹5 = ₹13.
Symbolic: Total = price 1 + price 2. Change = amount paid − total cost.
Visual: Picture coins and notes: a ₹50 note used to buy a ₹32 item leaves ₹50 − ₹32 = ₹18 in change.
Level 2 — Going deeper
When paying with a note larger than the total cost, always subtract the total cost from the note's value to find the change. If buying several items, add all the prices first before subtracting.
NCERT anchor
NCERT Math Mela, Class 3 money chapters use shop and market scenes with coins and notes to practise totals and change-making.
Worked example
A toy costs ₹65. Aisha pays with a ₹100 note. How much change does she get?
Step 1 — Amount paid: ₹100
Step 2 — Cost of toy: ₹65
Step 3 — Change = ₹100 − ₹65 = ₹35
Answer: ₹35
A pencil costs ₹12 and a notebook costs ₹38. What is the total cost, and how much change from ₹100?
Step 1 — Total cost = ₹12 + ₹38 = ₹50
Step 2 — Change = ₹100 − ₹50 = ₹50
Answer: Total ₹50; Change ₹50
Common mistakes
| Mistake | Why | Fix |
|---|---|---|
| Adding the amount paid to the price instead of subtracting for change | Confusing the operation needed | Change = amount paid − total cost, always subtraction |
| Forgetting to add all item prices before subtracting | Only using one item's price | Add every item's price first to get the total cost |
| Mixing up ₹ and paise | Not converting between units | Remember 100 paise = ₹1 before combining the two |
Quick check
- A book costs ₹45. Rohit pays with a ₹50 note. What is his change?
- Priya buys a ₹22 item and a ₹18 item. What is the total cost?
- How many paise make ₹3?
- Stretch: Sam buys a ₹28 item and a ₹34 item and pays with a ₹100 note. How much change does he get? (₹38)
Revision tip: Always add first when buying multiple items, then subtract from the amount paid to find change.
Open the Practice tab for graded questions on Money.
Key Takeaways (TL;DR)
- What you'll learn
- Key concepts
- Worked example
- Common mistakes
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