Class 6 Maths Chapter 3 MCQ

NCERT CLASS 6 | MATHEMATICS | GANITA PRAKASH

Chapter 3: Number Play MCQs

1. In the children’s line activity, what does the number spoken by each child represent?
A. Number of shorter neighbours
B. Number of taller neighbours
C. Total number of children
D. Position in the line
Answer: B. Number of taller neighbours

2. When does a child say ‘0’ in the line activity?
A. When both neighbours are taller
B. When one neighbour is taller
C. When neither neighbour is taller
D. When the child is standing at the end
Answer: C. When neither neighbour is taller

3. Can all children in a line say only ‘0’ if they are of different heights?
A. Yes, always
B. No
C. Only if there are three children
D. Only if the tallest child stands first
Answer: B. No

4. What is a supercell in a row of numbers?
A. A cell containing an even number
B. A cell containing the smallest number
C. A cell containing a number greater than its adjacent cells
D. A cell containing a prime number
Answer: C. A cell containing a number greater than its adjacent cells

5. In a row, which cells are considered adjacent to a particular cell?
A. All cells in the row
B. Only the cells immediately to its left and right
C. Only the first and last cells
D. Cells containing even numbers
Answer: B. Only the cells immediately to its left and right

6. Why is 626 a supercell in the given example?
A. It is an even number
B. It is greater than 577 and 345
C. It is the smallest number
D. It has three digits
Answer: B. It is greater than 577 and 345

7. In a two-dimensional supercell table, which cells are considered neighbours?
A. Only diagonal cells
B. Only cells on the same row
C. Cells immediately to the left, right, top and bottom
D. All cells in the table
Answer: C. Cells immediately to the left, right, top and bottom



8. Will the cell containing the largest number in a table always be a supercell?
A. Yes
B. No
C. Only in an even-sized table
D. Only if it is in the middle
Answer: A. Yes

9. Can the smallest number in a table be a supercell?
A. Always
B. Sometimes
C. No
D. Only in a corner
Answer: C. No

10. What is the main aim when filling a supercell table to get the maximum number of supercells?
A. Arrange numbers in ascending order
B. Arrange numbers in descending order
C. Place larger numbers in alternate cells
D. Repeat the same number
Answer: C. Place larger numbers in alternate cells

11. Which of the following is the correct order of numbers on a number line?
A. 3000, 2000, 1000, 4000
B. 1000, 2000, 3000, 4000
C. 4000, 3000, 2000, 1000
D. 2000, 4000, 1000, 3000
Answer: B. 1000, 2000, 3000, 4000



12. Which number lies between 2000 and 3000?
A. 1500
B. 3050
C. 2754
D. 3600
Answer: C. 2754

13. Which of the following numbers is the greatest?
A. 5030
B. 5300
C. 503
D. 5003
Answer: B. 5300

14. How many one-digit numbers are there, starting from 1?
A. 8
B. 9
C. 10
D. 11
Answer: B. 9

15. What is the smallest two-digit number?
A. 9
B. 10
C. 11
D. 99
Answer: B. 10



16. What is the digit sum of 68?
A. 12
B. 13
C. 14
D. 15
Answer: C. 14

17. What is the digit sum of 176?
A. 12
B. 13
C. 14
D. 15
Answer: C. 14

18. Which of the following numbers has a digit sum of 14?
A. 245
B. 352
C. 431
D. 623
Answer: A. 245

19. What is the smallest number whose digit sum is 14?
A. 59
B. 68
C. 77
D. 86
Answer: B. 68

20. What is the digit sum of 545?
A. 12
B. 13
C. 14
D. 15
Answer: C. 14

21. What are numbers that read the same from left to right and right to left called?
A. Prime numbers
B. Even numbers
C. Palindromic numbers
D. Composite numbers
Answer: C. Palindromic numbers

22. Which of the following is a palindrome?
A. 123
B. 454
C. 567
D. 789
Answer: B. 454

23. Which of the following is a four-digit palindrome?
A. 1234
B. 1221
C. 1243
D. 1123
Answer: B. 1221

24. Which of the following is a three-digit palindrome using the digits 1, 2 and 3?
A. 123
B. 132
C. 121
D. 231
Answer: C. 121

25. In the reverse-and-add method, what should be done first?
A. Multiply the number by 2
B. Reverse the digits and add the number to its reverse
C. Divide the number by 10
D. Subtract the reverse from the original number
Answer: B. Reverse the digits and add the number to its reverse

26. Who discovered the fascinating number pattern involving 4-digit numbers in 1949?
A. Lothar Collatz
B. D. R. Kaprekar
C. Aryabhata
D. Euclid
Answer: B. D. R. Kaprekar

27. What is the Kaprekar constant?
A. 6174
B. 6147
C. 6471
D. 6714
Answer: A. 6174

28. What is the first step in the Kaprekar process?
A. Choose a 2-digit number
B. Choose a 4-digit number with at least two different digits
C. Choose a 5-digit palindrome
D. Choose an even number only
Answer: B. Choose a 4-digit number with at least two different digits

29. In the Kaprekar process, what is done after arranging the digits to form the largest and smallest numbers?
A. Add the two numbers
B. Multiply the two numbers
C. Subtract the smallest number from the largest
D. Divide the largest number by the smallest
Answer: C. Subtract the smallest number from the largest

30. What is the result of 8632 − 2368?
A. 6264
B. 6174
C. 6246
D. 6374
Answer: A. 6264

31. Which type of clock is discussed in the chapter’s clock-number activity?
A. 24-hour clock
B. 12-hour clock
C. Digital stopwatch
D. Sundial
Answer: B. 12-hour clock

32. Which of the following is an example of a palindromic time?
A. 10:01
B. 10:10
C. 12:30
D. 04:44
Answer: A. 10:01

33. What is special about the date 11/02/2011 mentioned in the chapter?
A. All its digits are even
B. Its digits read the same from left to right and right to left
C. It contains only three different digits
D. It is a leap-year date
Answer: B. Its digits read the same from left to right and right to left

34. What does estimation mean?
A. Finding an exact answer every time
B. Making a reasonable approximate calculation
C. Multiplying all numbers
D. Counting without using numbers
Answer: B. Making a reasonable approximate calculation

35. Paromita estimated the number of children in her class by considering which information?
A. The number of teachers
B. The number of sections and children in each section
C. The number of classrooms
D. The number of school buses
Answer: B. The number of sections and children in each section

36. If a class has 32, 29 and 35 children in its three sections, approximately how many children are there altogether?
A. 50
B. 75
C. 100
D. 150
Answer: C. 100

37. In the Collatz sequence, what should be done if the number is even?
A. Multiply it by 3
B. Add 1 to it
C. Take half of it
D. Subtract 3 from it
Answer: C. Take half of it

38. In the Collatz sequence, what should be done if the number is odd?
A. Divide it by 2
B. Multiply it by 3 and add 1
C. Subtract 1 and multiply by 2
D. Add 2 to it
Answer: B. Multiply it by 3 and add 1

39. Who proposed the Collatz conjecture in 1937?
A. D. R. Kaprekar
B. Lothar Collatz
C. Isaac Newton
D. Pythagoras
Answer: B. Lothar Collatz

40. What is the Collatz conjecture about?
A. Every whole number is prime
B. Every number is a palindrome
C. The sequence starting from any whole number will eventually reach 1
D. Every even number is divisible by 4
Answer: C. The sequence starting from any whole number will eventually reach 1

41. What is the current status of the Collatz conjecture, as described in the chapter?
A. It has been proved true
B. It has been proved false
C. It remains an unsolved problem
D. It applies only to even numbers
Answer: C. It remains an unsolved problem

42. In Game #1, what numbers can a player add to the previous number?
A. 1, 2 or 3
B. 2, 3 or 4
C. 1, 3 or 5
D. 3, 4 or 5
Answer: A. 1, 2 or 3

43. What number must a player reach to win Game #1?
A. 10
B. 15
C. 20
D. 21
Answer: D. 21

44. In Game #2, what is the winning number?
A. 21
B. 50
C. 99
D. 100
Answer: C. 99

45. In Game #2, what numbers can a player add at each turn?
A. Between 1 and 3
B. Between 1 and 5
C. Between 1 and 10
D. Between 5 and 15
Answer: C. Between 1 and 10

46. What is the main purpose of mental mathematics activities in the chapter?
A. To avoid using numbers
B. To find sums using numbers in different ways mentally
C. To memorise multiplication tables only
D. To draw geometrical figures
Answer: B. To find sums using numbers in different ways mentally

47. Which operation is used in the example 38,800 = 25,000 + 400 × 2 + 13,000?
A. Addition and multiplication
B. Subtraction and division
C. Multiplication and subtraction
D. Division and addition
Answer: A. Addition and multiplication

48. What is the sum of 12,350 and 24,545?
A. 36,795
B. 36,895
C. 37,895
D. 35,895
Answer: B. 36,895

49. According to the chapter summary, what is computational thinking?
A. Memorising all numbers
B. Thinking about and formulating set procedures to use numbers
C. Solving only multiplication problems
D. Learning numbers without applying them
Answer: B. Thinking about and formulating set procedures to use numbers

50. Which of the following is a purpose of using numbers mentioned in the chapter?
A. To discover patterns and solve puzzles
B. To avoid estimation
C. To remove the need for calculations
D. To use numbers only for counting
Answer: A. To discover patterns and solve puzzles

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