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Multiplication of Numbers

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Question

Look at the rate list given below and find the total estimate cost of 22 kg of plastic, 23 kg of waste-paper, and 12 kg of iron. Will it be more or less than Rs 500?

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Solution

Solution:

Price of 1 kg plastic = ₹ 10
The total price for 22 kg plastic = 22 × ₹10 = ₹220
Price of 1 kg waste paper = ₹ 4
The total price for 23 kg waste paper = 23 × ₹4 = ₹92
92 can rounded off as ₹90.
Price of 1 kg iron = ₹ 12
The total price for 12 kg iron = 12 × ₹12
This can be rounded off as 12 × ₹10 = ₹120
Thus, the estimated cost will be = 220 + 90 + 120 = ₹ 430
Hence, the approximate cost will be less than ₹500.

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Similar questions

Q. Look up the rate list to see today's rates. Help Kiran to find out the cost of the junk.
• How much will Kiran pay for 31 kg newspaper?
1 kg newspaper costs Rs 5. 30 kg cost Rs 5 × 30 = Rs 150. So for 31 kg she pays Rs _____.
• How much will Kiran pay for 42 kg newspaper?
• Also find the cost of:
(a) 22 kg of plastic
(b) 23 kg of waste paper
(c) 12 kg of iron

Rate-List
Kind of Junk	Price of 1 Kg
1. Waste Paper	Rs 4/-
2. Newspaper	Rs 5/-
3. Iron	Rs 12/-
4. Brass	Rs 170/-
5. Plastic	Rs 10/-

Can you do this without writing?
Guess the total money Kiran will pay to the junk collectors. Will it be
— More than 600?
— Less than 600?

Look at the yellow price list.
(a) How much does 2 kg of tomato cost?
(b) How much does

\frac{1}{2}

kg of tomato cost?
(c) Kiran wants

2 \frac{1}{2}

kg of tomato. How much will it cost?
(d) How much does

3 \frac{1}{2}

kg potato cost?
(e) What is the price of

1 \frac{1}{4}

kg of carrot?
(f) He bought a gourd of weight

4 \frac{3}{4}

kg and it costs _________
(g) Look at the shopping list in Keerti's hand. How much will she have to pay to buy all of these?

(h) Make a bill of your own for vegetables you want to buy. Find the total money you will have to pay.

Item	Price in Rs (per kg)	Amount

Total

Look at the rate list given below and estimate the cost of 22 kg of plastic and 12 kg of iron.

Q. Dinu has a junk shop. His rate list is given below. If he buys 12 kg of waste paper, 6 kg of iron, and 2 kg of plastic, how much does he need to pay?

Q. Look at the rate list given below and estimate how much will Kiran pay for 42 kg of newspapers.

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