Samacheer Kalvi Class 5 Maths Solutions Term 3 Chapter 5 Money Exercise 5.2

Question 1. Fill in the blanks
(i) \( \text{Rs } 75 \times 5 = \underline{\hspace{1cm}} \)
Answer: \( \text{Rs } 75 \times 5 = 375 \)
In simple words: When you multiply 75 rupees by 5, the total amount you get is 375 rupees.

🎯 Exam Tip: Remember to carry over tens accurately when multiplying larger numbers, and always include the currency symbol in the final answer.

Question 1.
(ii) \( \text{Rs } 200.25 \div 25 = \underline{\hspace{1cm}} \)
Answer: \( \text{Rs } 200.25 \div 25 = \text{Rs } 8.01 \)
In simple words: If you divide 200 rupees and 25 paise by 25, each share will be 8 rupees and 1 paisa.

🎯 Exam Tip: When dividing decimals, divide as usual and place the decimal point in the quotient directly above the decimal point in the dividend.

Question 1.
(iii) \( \text{Rs } 3500 \div 500 = \underline{\hspace{1cm}} \)
Answer: \( \text{Rs } 3500 \div 500 = \text{Rs } 7 \)
In simple words: When 3500 rupees are split equally into 500 parts, each part is worth 7 rupees.

🎯 Exam Tip: For divisions with zeros at the end of both numbers, you can cancel out an equal number of zeros from each to simplify the calculation, for example, \( 3500 \div 500 \) becomes \( 35 \div 5 \).

Question 1.
(iv) \( \text{Rs } 15.50 \times 100 = \underline{\hspace{1cm}} \)
Answer: \( \text{Rs } 15.50 \times 100 = 1550 \)
In simple words: Multiplying 15 rupees and 50 paise by 100 moves the decimal point two places to the right, making it 1550 rupees.

🎯 Exam Tip: Multiplying by 10, 100, or 1000 simply involves shifting the decimal point to the right by the number of zeros in the multiplier.

Question 2. Answer the following
(i) \( \text{Rs } 98725 \times 5 \)
Answer: \( \text{Rs } 98725 \times 5 = \text{Rs } 4,93,625 \). This calculation is a simple multiplication of a five-digit number by a single digit.
In simple words: When you multiply 98,725 rupees by 5, you get a total of 4,93,625 rupees.

🎯 Exam Tip: Be careful with carrying over numbers when doing multiplication, especially with larger values, to ensure accuracy.

Question 2.
(ii) \( \text{Rs } 679.68 \times 7 \)
Answer: \( \text{Rs } 679.68 \times 7 = \text{Rs } 4757.76 \). Multiplying numbers with decimals follows the same steps as whole numbers, with careful placement of the decimal point at the end.
In simple words: If you multiply 679 rupees and 68 paise by 7, the total comes out to 4,757 rupees and 76 paise.

🎯 Exam Tip: Count the total number of decimal places in the numbers you are multiplying, and that's how many decimal places your final answer should have.

Question 2.
(iii) \( 362.37 \times 12 \)
Answer: \( 362.37 \times 12 = \text{Rs } 4348.44 \). To multiply by a two-digit number, you first multiply by the units digit, then by the tens digit, and add the results.
In simple words: Multiplying 362.37 by 12 gives you 4,348.44 rupees.

🎯 Exam Tip: Break down two-digit multiplication into simpler steps: multiply by the ones digit, then by the tens digit (adding a zero), and finally add the two results.

Question 2.
(iv) \( 324.52 \div 28 \)
Answer: \( 324.52 \div 28 = \text{Rs } 11.59 \). Division involves splitting a larger number into equal smaller parts, and for decimals, the decimal point in the answer is placed directly above its position in the number being divided.
In simple words: Dividing 324.52 rupees by 28 results in 11 rupees and 59 paise for each part.

🎯 Exam Tip: When doing long division with decimals, make sure to align the decimal point in your quotient (answer) directly above the decimal point in the dividend (number being divided).

Question 2.
(v) \( 7980 \div 8 \)
Answer: \( 7980 \div 8 = \text{Rs } 997.5 \). This is a straightforward division problem where you divide the total amount by 8 to find the value of each part. The result can be expressed with a decimal.
In simple words: When 7980 rupees are divided into 8 equal parts, each part is 997 rupees and 50 paise.

🎯 Exam Tip: Remember that "Rs 997.5" is the same as "Rs 997.50" when dealing with money, indicating 50 paise.

Question 2.
(vi) \( 397.10 \div 11 \)
Answer: \( 397.10 \div 11 = \text{Rs } 36.10 \). Dividing a decimal number by a whole number requires careful attention to the decimal point.
In simple words: If you divide 397 rupees and 10 paise by 11, each share will be 36 rupees and 10 paise.

🎯 Exam Tip: Always extend the dividend with zeros if necessary to continue the division and get an exact decimal answer, especially for money calculations which often need two decimal places.

Question 3. The cost of 1 kg of tomato is Rs 15. Find the cost of 5 kg of tomatoes?
Answer: The cost of 1 kg of tomato is \( \text{Rs } 15 \). To find the cost of 5 kg of tomatoes, we multiply the cost per kg by the total kilograms needed.
Cost of 5 kg of tomatoes \( = \text{Rs } 15 \times 5 = \text{Rs } 75 \).
In simple words: One kilogram of tomatoes costs 15 rupees. So, 5 kilograms will cost 75 rupees.

🎯 Exam Tip: For problems involving multiple quantities, always clearly state the cost per unit first before performing the multiplication.

Question 4. The cost of one egg is Rs 4.50. Find the cost of 20 eggs.
Answer: The cost of one egg is \( \text{Rs } 4.50 \). To find the cost of 20 eggs, we need to multiply the cost of one egg by the number of eggs.
Cost of 20 eggs \( = \text{Rs } 4.50 \times 20 = \text{Rs } 90.00 \).
In simple words: If one egg costs 4 rupees and 50 paise, then 20 eggs will cost 90 rupees.

🎯 Exam Tip: When multiplying decimals by whole numbers like 10 or 20, you can sometimes simplify by thinking of \( \text{Rs } 4.50 \times 2 \) (which is \( \text{Rs } 9 \)) and then multiplying by 10 to get \( \text{Rs } 90 \).

Question 5. The school management has decided to give a pen for all children participating celebration. The cost of a pen is Rs 18. How much money do they need to buy pens for 256 children?
Answer: The cost of one pen is \( \text{Rs } 18 \). There are 256 children participating. To find the total money needed, we multiply the cost of one pen by the number of children.
Money needed \( = 256 \times \text{Rs } 18 = \text{Rs } 4608 \).
In simple words: Each pen costs 18 rupees, and 256 children need one. So, the school needs 4608 rupees in total.

🎯 Exam Tip: Always clearly identify the unit cost and the total number of items to be purchased before performing the multiplication.

Question 6. A fruit seller buys 8 boxes of grapes for Rs 2,000. What is the cost of one box?
Answer: The fruit seller bought 8 boxes of grapes for a total of \( \text{Rs } 2000 \). To find the cost of one box, we need to divide the total cost by the number of boxes.
Cost of one box \( = \text{Rs } 2000 \div 8 = \text{Rs } 250 \).
In simple words: If 8 boxes of grapes cost 2000 rupees, then one box costs 250 rupees.

🎯 Exam Tip: When dividing money, ensure your division process is accurate to avoid errors, especially when dealing with remainders that would become paise.

Question 7. In a sweet stall, the cost of 18 kg of sweets is Rs 2,520. What is the cost of 1 kg of sweet?
Answer: The cost of 18 kg of sweets is \( \text{Rs } 2,520 \). To find the cost of 1 kg of sweet, we divide the total cost by the total quantity in kilograms.
Cost of 1 kg of sweet \( = \text{Rs } 2520 \div 18 = \text{Rs } 140 \).
In simple words: 18 kilograms of sweets cost 2520 rupees. So, one kilogram of sweets costs 140 rupees.

🎯 Exam Tip: Always identify the total cost and total quantity to correctly apply division for finding the unit price.