Class 4 - Maths

Learning Objectives

Students will understand the relationship between rupees and paise (1 Rs = 100 paise).
Students will write money amounts using decimal notation (e.g., Rs 45.75).
Students will add and subtract money amounts.
Students will make bills and calculate totals and change.

Introduction

We use money every day -- to buy vegetables at the sabzi mandi, pay the auto fare, or buy books from a shop. In India, our currency is the Indian Rupee (Rs). The smaller unit is the paisa.

1 Rupee = 100 Paise. We write money using a decimal point to separate rupees and paise. For example, forty-five rupees and seventy-five paise is written as Rs 45.75.

Writing Money with Decimals

The number before the decimal point shows rupees. The number after the decimal point shows paise. Always write paise using two digits.

Example 1: Writing Money

Twelve rupees and fifty paise = Rs 12.50

Seven rupees and five paise = Rs 7.05 (not Rs 7.5)

Two hundred rupees = Rs 200.00

Converting: Rs 8.35 = 800 paise + 35 paise = 835 paise. Similarly, 460 paise = Rs 4.60.

Adding and Subtracting Money

Line up the decimal points, then add or subtract as you would with normal numbers.

Example 2: Adding Money

Aarav bought a pencil for Rs 8.50 and an eraser for Rs 5.75. What is the total?

Rs 8.50 + Rs 5.75 = Rs 14.25

Example 3: Subtracting Money (Finding Change)

Meera gave Rs 500 to buy a book costing Rs 185.50. What change did she get?

Rs 500.00 - Rs 185.50 = Rs 314.50

Always write paise as two digits after the decimal. Rs 6.5 should be written as Rs 6.50.

Making a Bill

A bill is a list of items bought with their prices. We add all the amounts to find the total.

Example 4: Priya's Stationery Bill

Item	Quantity	Price Each	Total
Notebook	3	Rs 35.00	Rs 105.00
Pen	2	Rs 12.50	Rs 25.00
Ruler	1	Rs 15.00	Rs 15.00

Grand Total = Rs 105.00 + Rs 25.00 + Rs 15.00 = Rs 145.00

Key Words and Meanings

Word	Meaning
Rupee (Rs)	The main unit of Indian currency
Paisa (p)	The smaller unit; 100 paise = 1 rupee
Decimal Point	The dot that separates rupees from paise (e.g., Rs 45.75)
Bill	A list showing items, quantities, prices, and total cost
Change	The money returned when you pay more than the cost

Key Points to Remember

1 Rupee = 100 Paise. Always write paise as two digits after the decimal point.
To add or subtract money, line up the decimal points carefully.
To find change: Change = Amount Given - Cost of Item.
To make a bill: Total for each item = Quantity x Price. Grand Total = Sum of all item totals.
To convert: Rs to paise -- multiply by 100. Paise to Rs -- divide by 100.

Practice Questions

A. Write in decimal form (Rs and paise)

Twenty-three rupees and sixty paise = Rs
Nine rupees and five paise = Rs
150 paise = Rs
Rs 7.80 = paise

B. Add or Subtract

Rs 45.50 + Rs 32.75 = Rs
Rs 120.00 + Rs 85.60 = Rs
Rs 500.00 - Rs 237.50 = Rs
Rs 1000.00 - Rs 648.75 = Rs

C. Make a Bill and Find the Total

Item	Quantity	Price Each
Milk (1 litre)	2	Rs 28.00
Bread	1	Rs 40.00
Eggs (pack of 6)	1	Rs 42.50
Biscuits	3	Rs 15.00
Grand Total =

D. Word Problems

Rohan bought a cricket bat for Rs 375.50 and a ball for Rs 85.00. How much did he spend in all?
Ananya had Rs 1000. She bought a school bag for Rs 650.75. How much change did she receive?
A shopkeeper sold 5 kg of rice at Rs 62.50 per kg. What was the total cost?

E. Multiple Choice Questions

How many paise are there in Rs 3.50?
(a) 35(b) 305(c) 350(d) 3500
Rs 500.00 - Rs 123.75 = ?
(a) Rs 376.25(b) Rs 377.25(c) Rs 376.75(d) Rs 386.25

Fun Activity -- My Shopping List

Imagine you have Rs 500. Write a shopping list of 5 items you want to buy. Write the price of each item. Find the total and the change you will receive.

S.No.	Item	Price (Rs)
1
2
3
4
5

Total = Rs ____________ | Change from Rs 500 = Rs ____________

Mathematics -- Class 4

Mathematics -- Class 4 (continued)