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
Related Topics
Privacy Policy, Terms and Conditions, DMCA Policy and Compliant
Copyright © 2018-2023 BrainKart.com; All Rights Reserved. Developed by Therithal info, Chennai.