Mental Maths for Class 4

# Mental Maths for Class 4

## Mental Maths for Class 4 with Answers

Mental Maths for Class 4 contains every type of mental maths questions for class 4 students.

In this post, you will find 80 mental maths questions with answers.

Mental Maths for Class 4 covers the following topics:

•         Large Numbers
•         Multiplication
•         Division
•         Shapes
•         Patterns and symmetry
•         Perimeter and area
•         Money

## Mental Maths for Class 4 with Answers

Choose the correct option.

1. Which of the following is the smallest?

a. 7324 rounded off to the nearest 10

b. 7318 rounded off to the nearest 10

c. 7349 rounded off to the nearest 100

d. 7351 rounded off to the nearest 100

2. The prices of four air conditioners are  32,760,  33,460,  30,720 and  31,690. The cheapest air conditioner is

a.  32,760

b.  33,460

c.  30,720

d.  31,690

3. The smallest 5-digit number that can be formed using the digits 0, 2, 3, 5 and 6 is

a. 23,560

b. 23,650

c. 20,356

d. 20,563

4. The largest 6-digit number with 0 as one of its digits is

a. 9,99,909

b. 9,99,099

c. 9,09,990

d. 9,99,990

5. The cost of a refrigerator is  100 less than  16,590. Its actual cost is

a.  16,490

b.  15,590

c.  17,590

d.  15,690

6. The difference between the place values of 5 in 34,509 and 67,235 is

a. 505

b. 525

c. 495

d. 475

7. The population of a village is 7892. When it is rounded off to the nearest 1000, the population will be

a. 7000

b. 7800

c. 8000

d. 7900

8. The weight of a blue whale is 1235 kg. If the weight is rounded off to the nearest hundred, it will be ....................... kg.

a. 1300

b. 1200

c. 1230

d. 1240

9. While filling a form, Sruti writes the age of her father as XXXIX. What is the age of her father?

a. 29 years

b. 39 years

c. 49 years

d. 34 years

10. One more than the greatest 5-digit number is

a. 1000

b. 10000

c. 100000

d. 1000000

11. Find the sum of 100 and the largest 5-digit number. ..............................

12. What is 30104 + 326? ..............................

13. 7 + 70 + .................... + 7000 = 7077

14. The difference between the largest 5-digit even number and the smallest 5-digit even number is ..................... .

15. The sum of the smallest 5-digit odd number and the smallest 4-digit odd number is ..................... .

16. Find the sum of 1000 and the smallest 6-digit odd number. ..............................

17. What needs to be subtracted from 83,897 to get 83,797? .............................. .

Choose the correct option in Q.18 to Q.20.

18. The difference between the largest 6-digit number and the smallest 6-digit number is

a. 99999

b. 10000

c. 899999

d. 12000

19. A school library has 13,465 books. 4120 more books are added to the library. The total number of books in the library is

a. 17,585

b. 17,680

c. 19,505

d. 17,013

20. The sum of the smallest 6-digit odd number and the largest 5-digit even number is

a. 19,999

b. 8,99,999

c. 1,99,999

d. 1,27,300

Solve the following.

21. Compute 12 × 70: ___________

22. Find 11 × 3 × 10: ___________

23. What is 27 × 1000? ___________

24. 23 × 614 = 614 × ___________

25. Find 8 × 16 × 0: __________

Choose the correct option.

26. The value of 19 × 100 is _________.

a. 19           b. 190

c. 1900        d. 19000

27. A car covers 15 km with 1 litre of petrol. The distance covered by the car with 28 litres of petrol is __________.

a. 420 km          b. 280 km

c. 140 km          d. 560 km

28. The value of 13(35 + 45) is equal to ____________.

a. 13 × 70          b. 13 × 80

c. 13 × 35          d. 13 × 45

29. The value of 16 × 300 is the same as ____________.

a. 16 × 3

b. 16 × 30

c. 8 × 3 × 100

d. 48 × 100

30. Fill in the missing numbers. One has been done for you.

 Number of spider Number of legs 1 8 12 42 74

Who am I?

31. I am a number greater than 45, but less than 50. When I am divided by 11,

I leave a remainder 3. I am ____________ .

32. I am a number less than 80, but greater than 70. When I am divided by 8, the

remainder is 2. I am ____________ .

33. I am a number greater than 64, but less than 68. I leave 1 as remainder when divided by 5. I am ____________ .

34. I am a number greater than 72 and less than 85. I leave 5 as remainder when divided by 12. I am ____________ .

35. I am a number greater than 12 × 5 and less than 13 × 5. When I am divided by 6,

I leave a remainder 4. I am _____________ .

Choose the correct option.

36. Rohan has  132 and he wants to buy pens. Each pen costs  12. How many pens can he buy?

a. 10          b. 11

c. 12          d. 13

37. The product of two numbers is 1200. If one of them is 30, then the other number is

a. 400         b. 40

c. 50            d. 300

38. Hema paid  4500 as half-yearly membership in a gym. The monthly fee is

a.  700           b.  600

c.  500           d.  750

39. The money collected towards a one-day trip amounts to  8500. If 50 students were going for the trip, then the contribution of each student is

a.  150             b.  160

c.  170             d.  180

40. 14 boxes weigh 420 kg. The weight of one box is

a. 30 kg         b. 50 kg

c. 40 kg         d. 35 kg

41. What is the diameter of a circle if its radius is 11 cm? _____________

42. Name two different polygons with each one having 4 sides. _____________

43. A point where the edges of a polygon meet, is called a _____________.

44. A ruler is used to measure and draw a _____________.

45. A curve that begins and ends at the same point is known as a _____________.

46. A hexagon has _____________ sides.

47. The distance around a circle is called the _____________.

48. Name a solid shape with exactly two flat faces. _____________

49. Name a solid shape with no edges and no corners. ____________

50. A rectangular water tank is an example of _____________.

51. How many lines of symmetry does a square have? ______________

52. How many lines of symmetry does a regular hexagon have? _____________

53. In how many equal parts does the line of symmetry divide a figure? _________

54. Is 150, 140, 130 and 120 a growing pattern or a decreasing pattern? _________

55. The next term in the pattern 21, 31, 41, 51 is ___________.

56. Honeycomb is an example of ____________ pattern.

57. The image which falls completely on the other half of the figure is called a _________.

58. 1, 2, 4, 7, 11, 16, 22, ……………

59. 100, 99, 97, 94, 90, 85, 79, …………….

60. Observe the pattern and fill in the blanks.

a.

3 × 19 = (3 × 20) – 3 = 60 – 3 = 57

4 × 19 = (4 × 20) – 4 = 80 – 4 = 76

5 × 19 = ................... – ........... = ........... – ........... = ...........

6 × 19 = ................... – ........... = ........... – ........... = ...........

b.

800000 ÷ 4 = 200000

80000 ÷ 4 = 20000

8000 ÷ 4 = ...................

800 ÷ 4 = ...................

80 ÷ 4 = ...................

Fill in the blanks.

61. The perimeter of a square of side 13 cm is ____________.

62. If the length and the breadth of a rectangle are 12 cm and 8 cm, respectively, then its perimeter is _____________.

63. If the lengths of three sides of a triangle are 11 cm, 9 cm and 7 cm, then the perimeter of the triangle is _____________.

64. In an irregular figure, area of a square which is half or more than half covered is to be taken as _____________.

65. The perimeter of a rectangle is 44 cm. If its length is 12 cm, then its breadth is ______________.

66. The perimeter of a triangle is 86 cm. Two of its sides are 28 cm and 32 cm. The length of the third side is ______________.

67. If the length of a square is doubled, then its perimeter becomes __________.

68. The area of a square with side 6 cm is ………………… .

69. The area of a rectangle with dimensions 8 cm by 6 cm is …………………. .

70. Find the perimeter of the following figures.

71. How many paise make 4 rupees 35 paise? _____________

72. How many rupees are there in 520 paise? _____________

73. How much money do you need to buy 8 books each costing  145? ________

74. Is  1250 enough to buy 5 T-shirts each costing  240? _____________

75. Which is more profitable? Buying a packet of one dozen pencils for  48 or buying 8 pencils each costing  5?_____________

76. A group of students rented 4 identical crowns for a play. The rent of 1 crown is  150. What is the total rent of the crowns? _____________

77. 5 students decide to buy a gift for their teacher. If the budget is  250, what will be the share of each student? _______________

78. Two identical T-shirts and 2 identical shirts cost  1600 altogether. If the cost of 1 T-shirt is  350, then what is the cost of 1 shirt? _____________

79. How many 50-rupee notes can you get from a 500-rupee note? ____________

80. How many 100-rupee notes can you get from ten 200-rupee notes? ________

1. c          2. c

3. c          4. d

5. a          6. c

7. c           8. b

9. b          10. c

11. 1,00,099      12. 30,430

13. 0             14. 89,998

15. 11,002      16. 1,01,001

17. 100             18. c

19. a                  20. c

21. 840             22. 330

23. 27,000        24. 23

25. 0                  26. c

27. a                  28. b

29. d

30.

 Number of spider Number of legs 1 8 12 96 42 336 74 592

31. 47                32. 74

33. 66                 34. 77

35. 64                 36. b

37. b                   38. d

39. c                    40. a

41. 22 cm

42. Square and rectangle

43. Vertex       44. Line segment

45. Closed curve         46. 6

47. Circumference      48. Cylinder

49. Sphere          50. Cuboid

51. 4                    52. 6

53. 2            54. Decreasing pattern

55. 61           56. Tessellation

57. Symmetrical image

58. 29           59. 72

60. a. 5 × 19 = (5 × 20) – 5 = 100 – 5 = 95

6 × 19 = (6 × 20) – 6 = 120 – 6 = 114

b. 2000, 200, 20

61. 52 cm          62. 40 cm

63. 27 cm          64. 1 sq. units

65. 10 cm          66. 26 cm

67. double        68. 36 sq. cm

69. 48 sq. cm

70. a. 18 cm      b. 23 cm

c. 12.5 cm    d. 17.5 cm

71. 435 paise    72. 5 rupees 20 p

73. ₹ 1160        74. Yes

75. one dozen pencils for ₹ 48

76. ₹ 600           77. ₹ 50

78. ₹ 450          79. 10

80. 20

Worksheets for Maths

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