To learn to use Operations to find totals, change, multiple costs and unit cost.

__Introduction__

**To learn to use Operations to
find totals, change, multiple costs and unit cost.**

Panneerselvam and his three
friends went to seashore. They played and took rest. By that time they bought 4
packets of cereals from the seller for ₹ 20. Panneer does not know the cost of one packet then he asked his friend.

His friend explained him to find
out the cost.

4 packets of cereals = ₹ 20

∴ 1 packet of
cereals = ₹ 20 ÷ 4

So, 1 packet of cereals = ₹ 5.

Panneer and his friends have
eaten cereals and went to a tea shop. The price of tea was 5 rupees. Panneer
and his friends drunk tea and gave ₹ 20 to the seller.

Panneer does not know the total
cost of tea. He asked his friend to explain him,

Cost of one tea = ₹ 5

Cost of four tea = ₹ 5 × 4

Cost of four tea = ₹ 20

**Let us try**

Find the cost per item, if the
total cost is given. One is done for you.

**Fill in the following:**

Panneer and his friends spent the
amount for cereals ₹ 20 and another for tea ₹ 20. Also they spent ₹ 40 for horse – riding. They went home happily. After he went home he
calculated the amount left in ₹ 100.

Let us help
Panneer,

Cost of cereals = ₹ 20 +

Cost of tea = ₹ 20

The amount spent
for horse – riding = ₹ 40

Total
expenditure = __₹____ ____80 __

Total amount
with Panneer = ₹ 100

Amount Spent by
Panneer and his friends = − ₹ 80

Balance amount = __₹____ ____20__

**Activity**

1. Make the students to form a
model market to display the price list of the things to learn addition and
subtraction.

2. Write the value of currency in
the paper, make a student to act like a shopkeeper and the other students are
like customer, calculate the cost of things to learn addition and subtraction.

**EXAMPLE 1**

Nandhakumar spent the amount of ₹ 750 for 10 *l* petrol. What is the cost of 1 *l* petrol.

Nandhakumar
spent the amount for petrol = ₹ 750

∴ Cost for 1* l* petrol = ₹ 750 ÷ 10

= ₹ 75

**EXAMPLE 2**

Madhumitha bought 8 sweet
packets. If one packet costs ₹ 65, find the cost of 8 packets.

Cost of one
packet = ₹ 65

∴ Cost of eight packets = ₹ 65 × 8

∴ Cost of eight packets = ₹ 520

**EXAMPLE 3**

Selvam went to vegetable market
and bought onion for ₹ 10.50 and cucumber for ₹ 8.75. If he has given ₹ 20 to the shopkeeper then find the balance amount received by selvam.

Cost of onion = ₹ 10.50

∴ Cost of cucumber = ₹ 8.75

The amount spent
for vegetables = __₹____ ____19.25__

The amount given
to the shopkeeper = ₹ 20.00

The amount spent
for vegetables = ₹ 19.25

Balance amount = __₹____ ____0.75__

Tags : Money | Term 3 Chapter 5 | 4th Maths , 4th Maths : Term 3 Unit 5 : Money

Study Material, Lecturing Notes, Assignment, Reference, Wiki description explanation, brief detail

4th Maths : Term 3 Unit 5 : Money : Money: Introduction | Money | Term 3 Chapter 5 | 4th Maths

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