Samacheer Kalvi Class 4 Maths Solutions Term 1 Chapter 2 Numbers Exercise 2.3c

A. Subtract

 

Question 1. Subtract the following numbers:
Answer:

This subtraction shows how to borrow from the tens and hundreds places when a digit in the top number is smaller than the digit below it. You start subtracting from the ones column and move left.
In simple words: When you subtract, if the top number is smaller, you borrow from the number next to it. For this problem, 3445 minus 1348 equals 2097.

🎯 Exam Tip: Always align numbers by their place value (ones, tens, hundreds) before starting subtraction to avoid errors.

 

Question 2. Subtract the following numbers:
Answer:

Here, we subtract 2446 from 4965, requiring borrowing from the tens place for the ones column. This process of regrouping helps solve problems where a smaller digit is on top.
In simple words: To find the difference between 4965 and 2446, we subtract the numbers column by column. The answer is 2519.

🎯 Exam Tip: Remember to carry over the borrowed value correctly to the next column when doing subtraction, as a mistake can cascade.

 

Question 3. Subtract the following numbers:
Answer:

In this subtraction, we need to borrow multiple times, starting from the tens place, then hundreds. This shows how regrouping makes subtraction possible even when zeros are involved.
In simple words: We are subtracting 3397 from 6570. First, we borrow for the ones column, then for the tens column. The final answer is 3173.

🎯 Exam Tip: When borrowing across a zero, remember to first borrow from the next non-zero digit, making the zero a '10' before you can borrow from it again.

 

Question 4. Subtract the following numbers:
Answer:

Here, we perform subtraction on larger numbers, 8953 minus 5964. This involves borrowing across multiple places from the hundreds and thousands columns to complete the operation.
In simple words: When we subtract 5964 from 8953, we have to borrow across places like hundreds and thousands. The result is 2989.

🎯 Exam Tip: Double-check your borrowing steps by adding the answer back to the number you subtracted; it should equal the original top number.

B. Find the Difference Between Given Numbers.

 

(a) Find the difference between 4352 and 5020.
Answer: To find the difference, we subtract the smaller number from the larger number, which is 5020 - 4352.

The difference between the two numbers is 668. This is found by carefully borrowing from thousands, hundreds, and tens.
In simple words: To find how much bigger 5020 is than 4352, we subtract. The answer is 668.

🎯 Exam Tip: Always subtract the smaller number from the larger number to get a positive difference.

 

(b) Find the difference between 1438 and 3370.
Answer: We need to calculate 3370 - 1438 to find the difference.

The difference between 3370 and 1438 is 1932. This result is achieved through careful borrowing, especially when a digit is smaller than the one below it.
In simple words: When 1438 is taken away from 3370, the leftover amount is 1932.

🎯 Exam Tip: Pay extra attention when borrowing involves multiple columns, as it's a common area for calculation mistakes.

 

(c) Find the difference between 2526 and 8431.
Answer: We will find the difference by calculating 8431 - 2526.

The difference between 8431 and 2526 is 5905. This shows how subtraction is used to find the numerical gap between two values.
In simple words: To find how much bigger 8431 is than 2526, we subtract them. The difference is 5905.

🎯 Exam Tip: Remember that "find the difference" always implies subtraction, and the order is important to ensure a positive result.

 

(d) Find the difference between 3361 and 9000.
Answer: We need to subtract 3361 from 9000 to find the difference.

The difference between 9000 and 3361 is 5639. This requires borrowing across multiple zeros, which can be tricky if not done carefully.
In simple words: When we subtract 3361 from 9000, we get 5639. This shows the difference between the two numbers.

🎯 Exam Tip: When subtracting from a number with many zeros, remember to borrow from the first non-zero digit and then propagate the borrowing across the zeros.

C. Answer the Following Questions:

 

Question 1. The sum of two numbers is 7036, one number is 3168. Find the other number.
Answer:Total sum of two numbers \( = 7036 \) One number \( = 3168 \) To find the other number, we subtract the known number from the total sum: Other number \( = 7036 - 3168 \)

The other number is 3868. This problem demonstrates that if you know the sum and one part, you can always find the missing part using subtraction.
In simple words: The total of two numbers is 7036. One number is 3168. To find the second number, subtract the first number from the total. The other number is 3868.

🎯 Exam Tip: In word problems, identify whether you need to add or subtract. "Sum" often means addition, but "find the other number" given a sum implies subtraction.

 

Question 2. A man had Rs 9200 in the bank. He withdrew Rs 2756. How much money does he have in the bank now?
Answer:Total amount in the bank \( = \text{Rs } 9200 \) Amount withdrawn \( = \text{Rs } 2756 \) Remaining money \( = \text{Total amount} - \text{Amount withdrawn} \) Remaining money \( = \text{Rs } 9200 - \text{Rs } 2756 \)

The man now has Rs 6444 in the bank. This situation shows a real-world use of subtraction to calculate remaining balances after spending or withdrawals.
In simple words: A man had Rs 9200. He took out Rs 2756. To find how much money is left, we subtract the amount he took out from the starting amount. He has Rs 6444 left.

🎯 Exam Tip: Always write down the initial and final states or values to clearly understand what needs to be calculated in word problems.

D. Create the Subtraction Story Problems for the Details Given Below.

 

(a) Create a subtraction story problem for 1997 - 1968.
Answer: John was born in 1968. In what year did he turn 29 years old? (This implies a backward calculation, or you can phrase it as: "How many years old was John in 1997?") The problem asks to subtract 1968 from 1997.
In simple words: You need to make a story where you subtract 1968 from 1997. For example, "How much older is a person born in 1968 compared to someone born in 1997?" (Note: This is the prompt, the actual answer would be 29.)

🎯 Exam Tip: When creating story problems for subtraction, focus on scenarios like finding differences, remaining quantities, or how much is left.

 

(b) What is the difference between the price of two bags?
Answer: (Assuming the bags shown in the image are Rs 823 and Rs 914) Price of the first bag \( = \text{Rs } 823 \) Price of the second bag \( = \text{Rs } 914 \) Difference in price \( = \text{Rs } 914 - \text{Rs } 823 \) \( = \text{Rs } 91 \) The difference in price between the two bags is Rs 91. This simple calculation helps us compare the costs of different items.
In simple words: One bag costs Rs 914 and another costs Rs 823. To find the difference in their prices, subtract the smaller price from the bigger price. The difference is Rs 91.

🎯 Exam Tip: Always identify the two numbers you need to compare before performing the subtraction to find the difference.

 

(c) What is the difference between the height of two buildings?
Answer: (Assuming the buildings shown in the image are 153 feet and 108 feet tall) Height of the first building \( = 153 \) feet Height of the second building \( = 108 \) feet Difference in height \( = 153 - 108 \) \( = 45 \) feet The difference in height between the two buildings is 45 feet. This shows how subtraction can be used to compare physical measurements.
In simple words: One building is 153 feet tall and the other is 108 feet tall. To find how much taller one is than the other, subtract 108 from 153. The difference is 45 feet.

🎯 Exam Tip: Make sure to include the correct units (like "feet" or "Rs") in your final answer for measurement-based problems.