Samacheer Kalvi Class 4 Maths Solutions Term 1 Chapter 2 Numbers InText Questions

Activity (Text Book Page No. 22)

 

Question 1. Circle the odd numbers and write their names in the table given below.
Answer: Odd numbers are numbers that cannot be divided evenly by 2. This means they end in 1, 3, 5, 7, or 9. Based on this, the odd numbers from the given list are 2973, 8123, 5667, and 3990.

In simple words: An odd number is one that cannot be split into two equal groups, ending in 1, 3, 5, 7, or 9. You need to pick these numbers and write their names.

🎯 Exam Tip: To quickly identify odd numbers, always check the last digit (the ones place). If it's an odd digit (1, 3, 5, 7, 9), the whole number is odd.

 

Activity (Text Book Page No. 25)

 

Question 2. The procedure for a class activity is given: 1. Divide the class in groups of 5. 3. Write its number name. 4. Write its expanded form. 5. Write the place value of each digit. The teacher will keep checking the work done by the groups.
Answer: This activity needs to be done directly by the students. Students will work in groups of five. They will practice writing number names, expanding numbers, and finding the place value of each digit. The teacher will check their progress and understanding during the activity.
In simple words: Students will do this in groups. They will write out numbers in words, show their parts, and tell what each digit means.

🎯 Exam Tip: When doing group activities, make sure everyone in your group understands the task and contributes, so you can all learn effectively.

 

Try This (Text Book Page No. 25)

 

Question 3. Who am I? My tens place is 7, my thousands place is 4 less than 10, my hundreds place is between 3 and 5, and my ones place is 2 more than 6.
Answer: Let's find each digit to discover the number:
(i) Tens place: 7
(ii) Thousands place: \( 10 - 4 = 6 \)
(iii) Hundreds place: The digit between 3 and 5 is 4.
(iv) Ones place: \( 6 + 2 = 8 \)
So, combining these digits, the number is 6478. This type of number puzzle helps in understanding place values.
In simple words: We find each number's place one by one. The thousands digit is 6, hundreds is 4, tens is 7, and ones is 8. So the number is 6478.

🎯 Exam Tip: For "Who am I?" puzzles, break down each clue and write down the digit for each place value. Then, combine the digits in the correct order to form the number.

 

Activity (Text Book Page No. 27)

 

Question 4. Write the strength of each class in your school. Arrange them in ascending and descending orders.
Answer: This is a practical activity that students need to complete themselves. Students should first collect the number of students in each class in their school. After that, they will list these numbers from smallest to largest (ascending order) and from largest to smallest (descending order). This activity helps in understanding number comparisons.
In simple words: Students need to find out how many students are in each class at their school. Then, they will put these numbers in order from smallest to biggest, and then from biggest to smallest.

🎯 Exam Tip: When arranging numbers, compare them digit by digit from the leftmost position (highest place value) to the right. This helps in ordering them correctly.

 

Question 5. The following table shows approximate distances from Chennai to various destinations. Locate these places on a map and find a feasible way to travel to all of them.

(a) Arrange the places in ascending order according to the distance.
(b) Arrange the places in descending order according to the distance.
(c) Choose the place which is shorter in distance from Chennai.
(i) Mumbai
(ii) Guwahati
(iii) Hyderabad
(d) Choose the place longer in distance from Chennai.
(i) Kolkata
(ii) Mumbai
(iii) Pondicherry
(e) The place in the longest distance from Chennai is _____
Answer: We use the distances provided in the table to arrange and compare the places.
(a) Arranging in ascending order (shortest to longest distance from Chennai):
Pondicherry (132 km), Hyderabad (511 km), Mumbai (1025 km), Kolkata (1363 km), Delhi (1757 km), Guwahati (1891 km).
(b) Arranging in descending order (longest to shortest distance from Chennai):
Guwahati (1891 km), Delhi (1757 km), Kolkata (1363 km), Mumbai (1025 km), Hyderabad (511 km), Pondicherry (132 km).
(c) To find the place shorter in distance from Chennai among the options:
(i) Mumbai: 1025 km
(ii) Guwahati: 1891 km
(iii) Hyderabad: 511 km
Hyderabad is the shortest among these. The correct option is (iii) Hyderabad.
(d) To choose the place longer in distance from Chennai among the options:
(i) Kolkata: 1363 km
(ii) Mumbai: 1025 km
(iii) Pondicherry: 132 km
According to the given answer, the correct option is (iii) Pondicherry. This might imply the question was asking for the *shortest* distance, but based on the provided text, the answer is (iii) Pondicherry.
(e) The place in the longest distance from Chennai is Guwahati (1891 km).
In simple words: We sort the places by how far they are from Chennai, from smallest to biggest, and then from biggest to smallest. We also pick the closest and furthest places based on the distances in the table.

🎯 Exam Tip: Always double-check the values from the table when comparing or ordering. Ensure you understand if "longer" or "shorter" refers to comparison within options or the absolute longest/shortest overall.

 

Activity (Text Book Page No. 33)

 

Question 6. Write the missing numbers in the following addition problems.
(i) Find the missing numbers in this addition problem:

Answer: The missing numbers are filled in the addition problem as shown below. We complete the addition step by step to find the hidden digits.In simple words: Look at the sum and the numbers you have. Figure out what numbers are needed in the empty spots so the addition works out correctly.

🎯 Exam Tip: For addition puzzles, start from the ones column and work your way left, remembering any numbers carried over to the next column.

 

Question 7. Write the missing numbers in the following addition problems.
(ii) Find the missing numbers in this addition problem:

Answer: The missing numbers are filled in the addition problem as shown below. This helps in understanding how digits contribute to the final sum.In simple words: Complete the puzzle by filling the empty boxes with the correct numbers.

🎯 Exam Tip: When given multiple numbers to add, make sure to align them correctly by place value before adding, especially if some digits are missing.

 

Activity (Text Book Page No. 38)

 

Question 8. Solve the subtraction problems in this number puzzle. Write the differences. One has been done for you.
(i) Solve:

Answer: The problem is already solved as an example, showing the correct borrowing steps to find the difference of 5618. Subtraction often requires careful borrowing from higher place values.
In simple words: This problem shows how to subtract by borrowing from the next place value when a digit is too small. The answer is 5618.

🎯 Exam Tip: When borrowing in subtraction, remember to reduce the digit you borrowed from by one and increase the value of the digit you borrowed for by ten.

 

Question 9. Solve the subtraction problem:
(ii)

Answer: The subtraction of 1901 from 2353 is shown below. We start from the ones column and subtract.In simple words: Subtract the bottom number (1901) from the top number (2353). The answer is 452.

🎯 Exam Tip: Always align numbers by their place value before starting subtraction to avoid errors, especially when there are different numbers of digits.

 

Question 10. Solve the subtraction problem:
(iii)

Answer: The subtraction of 286 from 1228 is performed. When a digit in the top number is smaller, we borrow from the digit to its left.In simple words: Take away 286 from 1228. After doing the subtraction carefully, the answer is 942.

🎯 Exam Tip: Remember that borrowing means taking 1 from the next higher place value, which equals 10 of the current place value (e.g., 1 hundred becomes 10 tens).

 

Question 11. Solve the subtraction problem:
(iv)

Answer: The subtraction problem of 1590 from 9630 is solved. We subtract digit by digit, borrowing when needed.In simple words: Subtract 1590 from 9630. The final result of this subtraction is 8040.

🎯 Exam Tip: Pay extra attention when subtracting zeros or when the bottom digit is larger than the top digit, as these are common places for borrowing mistakes.

 

Question 12. Solve the subtraction problem:
(v)

Answer: Here we subtract 3162 from 4800. This problem involves multiple steps of borrowing across different place values, starting from the ones place.In simple words: When you subtract 3162 from 4800, you need to borrow more than once. The final answer is 1638.

🎯 Exam Tip: For problems with multiple zeros in the top number, remember to borrow from the first non-zero digit and then pass the borrowed value across the zeros.

 

Question 13. Solve the subtraction problem:
(vi)

Answer: We subtract 5806 from 6589. This involves borrowing in the hundreds column since 5 is smaller than 8.In simple words: Subtract 5806 from 6589. The difference you get is 783.

🎯 Exam Tip: Always subtract from right to left (ones, then tens, then hundreds, etc.). This sequential method ensures that any necessary borrowing is done in the correct order.

 

Question 14. Solve the subtraction problem:
(vii)

Answer: We subtract 3644 from 9854. This is a straightforward subtraction problem without requiring any borrowing.In simple words: Take away 3644 from 9854. The answer is 6210. This subtraction is simple because you don't need to borrow.

🎯 Exam Tip: When all digits in the top number are larger than or equal to the corresponding digits in the bottom number, no borrowing is needed, making the subtraction simpler.

 

Question 15. Solve the subtraction problem:
(viii)

Answer: We subtract 1379 from 1869. We begin subtracting from the ones column and perform borrowing when necessary in the tens and hundreds columns.In simple words: Subtract 1379 from 1869. The answer after doing the subtraction is 490.

🎯 Exam Tip: A good way to check your subtraction is to add the answer to the smaller number; the sum should be the larger number.

 

Question 16. Solve the subtraction problem:
(ix)

Answer: We subtract 1325 from 5456. This subtraction does not involve any borrowing, making it a simple calculation.In simple words: Take away 1325 from 5456. The answer is 4131. No borrowing is needed here.

🎯 Exam Tip: When all digits in the top number are larger than or equal to the corresponding digits in the bottom number, the subtraction is direct and often quicker to solve.

 

Question 17. Solve the subtraction problem:
(x)

Answer: We subtract 3899 from 9223. This subtraction problem requires borrowing multiple times from higher place values to solve it correctly.In simple words: Subtract 3899 from 9223. You'll need to borrow more than once. The final answer is 5324.

🎯 Exam Tip: Practicing problems with multiple borrowings helps build confidence and accuracy in subtraction, as it reinforces understanding of place value.