Mental Maths for Class 5

# Mental Maths for Class 5

## Mental Maths for Class 5 with Answers

Mental Maths for class 5 covers every type of mental maths questions for class 5 students.

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

Mental Maths for Class 5 covers the following topics:

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

## Mental Maths for Class 5 with Answers

1. Find the largest 7-digit number that can be rounded off as 75,16,000 to the nearest 1000.

2. Form the greatest and smallest 7-digit numbers by using the digits 6, 8, 3, 1, 0, 7 and 2 only once, and keeping 2 at the thousands place.

3. Write five 8-digit numbers by using the digits 9, 6, 3, 5, 1, 4, 7, 8 and arrange the numbers in descending order.

4. Write in words: 8,27,782 ___________________________________

5. Write in numerals. Eight crore sixty lakh sixty-five

__________________________________________________________

6. Write the smallest and the largest number that you can form using the digits 6, 2, 3, 7, 0, 9 and 5.

7. 12,20,180 people visited a museum in one year. Round it off to the nearest 100.

8. CDLX in Roman numerals is ____________ in the Hindu-Arabic numerals.

9. Compare the following numbers using <, > or = symbol.

a. 38,78,102 ___________ 2,00,02,581

b. 1,88,88,819 ____________ 1,79,99,999

10. Solve the following and write the answer in Roman numerals.

a. CXXIV + CXX: __________

b. LXXV – XVIII: __________

a. 40102030 + 18070605

b. 45930000 + 10003527

12. Subtract the following.

a. 100000000 – 99999999

b. 100000000 – 12345678

13. Find the sum of 26,34,52, 32,92,582 and 10,03,851. How much is this sum less than 1 crore?

14. Subtract 92,93,815 from the smallest 8-digit number.

15. Multiply.

a. 7253 by 100

b. 3084 by 1000

16. Divide and find the quotient and remainder.

a. 14355 ÷ 100

b. 11130 ÷ 1000

17. Fill in the blanks.

a. 78279 × __________ = 78279

b. 3875 × 100 = __________

c. 97825 ÷ __________ = 1

18. By which number 100 must be multiplied to get the product 64800?

19. Find the average of the first 10 even numbers.

20. Find the average of the first five multiples of 6.

21. Find the smallest prime factor of 187.

22. Determine whether 7 is a factor of 2395.

23. Write all the prime numbers between 10 and 40.

24. Which of the following are coprime?

a. 5, 19

b. 16, 18

c. 3, 25

d. 11, 48

25. Write 16, 36, 42 and 28 as the sum of two prime numbers.

26. Find the prime factors of 45, 121 and 72.

27. Check whether 25782 is divisible by 3 or not.

28. Draw the factor tree of 42, 70, 28 and 110.

29. Check if 35724 is divisible by 3 and 4. If yes, can we say it is also divisible by 6?

30. Check if 572972 is divisible by 18 or not.

31. The multiplicative inverse of ¾ is ……………………..

32. The simplest form of 12/18 is ……………………

33. How many halves are there in 4?

34. How many quarters are there in 5?

35. ½ × 26 = ………………..

36. ¾ × 32 = ………………..

37. ¼ + ½ = ………………..

38. ¾ – ½ = ………………..

39. Mixed fraction of 45/6 is ……………….

40. Three-eighths of sixteen is …………………………

41. Convert the following fractions into decimals.

a. 9/10

b. 275/100

42. Convert the following decimals into fractions.

a. 8.5

b. 4.2

43. Arrange in ascending order.

a. 41.21, 41.12, 41.012, 411.2

b. 8.71, 8.7, 8.8, 8.07

44. Arrange in descending order.

a. 15.3, 16.5, 15.8, 16.7

b. 1.02, 1.2, 1.002, 1.21

a. 4.85 + 14.12

b. 31.2 + 27.7

c. 5.45 + 3.02 + 8.009

d. 7.946 + 14.36 + 22.9

46. Subtract the following:

a. 4.8 – 2.712

b. 10 – 7.257

47. 98.4 × 88 × 0 × 12.45 = ………………..

48. 9486.835 ÷ 100 = ………………..

49. Find the product.

a. 7.12 × 10

b. 13.15 × 100

50. Divide the following:

a. 25.32 ÷ 10

b. 78.13 ÷ 100

51. 74 km = …………….. m

52. 47.4 m = ………….. cm

53. 36 hg = ………….. g

54. 56.2 dg = ……………. Mg

55. 38 L = ……………. cL

56. 83.1 dL = ………….. mL

57. Choose the correct answer to make the following statements meaningful.

a. The weight of a book is about 500 g / 500 kg.

b. The weight of a bike is about 200 g / 200 kg.

58. Write the next two numbers in the following sequence.

a. 3, 6, 10, 15, _______ , _______

b. 7, 17, 27, 37, _______ , _______

c. 2, 5, 10, 17, _______ , _______

d. 2, 5, 10, 50, _______ , _______

59. Find the twenty-third triangular number.

60. Find the fifty-sixth square number.

61. The length of the fence of a square field of side 9 m is ……………………

62. Find the side of the square, whose perimeter is given below:

a. P = 40 cm

b. P = 24 m

c. P = 4.8 m

63. The length of a carpet is 4.3 m and the breadth is 3.7 m. What will be its perimeter?

64. Find the measure of the side of a square, if its area is

a. 36 sq. cm

b. 49 sq. m

c. 64 sq. cm

65. What will be the area of a bed whose length is 2.5 m and breadth is 1.5 m?

66. Find the length of a ribbon to be pasted around a picture of length 50 cm and breadth 40 cm. Find the area of the picture also.

67. What is the area of the glass needed to cover a photograph of length 35 cm and breadth 20 cm?

68. What is the area of a wall of length 15 m and breadth 10 m? Also find its perimeter.

69. Find the volume of the cube whose dimensions are given below.

a. 8 cm

b. 12 cm

c. 16 m

70. Find the volume of the cuboid whose dimensions are given below.

a. 6 cm by 5 cm by 4 cm

b. 10 cm by 9 cm by 5 cm

71. Convert into hours.

a. 9 days

b. 14 days

c. 24 days 8 hours

72. Convert the following into days and hours.

a. 82 hours

b. 152 hours

c. 243 hours

73. Find the time duration for the following activities.

a. Starting time = 3:20 a.m.

Finishing time = 10:15 a.m.

b. Starting time = 4:26 p.m.

Finishing time = 11:34 p.m.

74. Convert the following temperatures into Fahrenheit scale.

a. 35°C

b. 45°C

c. 100°C

75. Convert the following temperatures into Celsius scale.

a. 122 °F

b. 158°F

c. 176°F

76. Atul bought a refrigerator for ₹ 15740 and sold it for ₹ 16280. What is his profit or loss?

77. If the selling price of a video game is ₹ 700 and profit is ₹ 200, then find the cost price of the video game.

78. Cost price of 1 dozen pens is ₹ 120 and profit made on selling them is ₹ 20. Find their selling price.

79. The cost of 7 pencil boxes is ₹ 777. What will be the cost of 11 such pencil boxes?

80. 4 cartons can hold 80 mangoes. How many mangoes can 15 cartons hold?

1. 75,15,999

2. Greatest number: 87,62,310

Smallest number: 10,32,678

3. 9,63,51,478; 9,13,56,478; 9,63,71,458; 8,63,51,479; 9,64,51,378

Descending order: 9,64,51,378; 9,63,71,458; 9,63,51,478; 9,13,56,478; 8,63,51,479

4. Eight lakh twenty-seven thousand seven hundred eighty-two

5. 8,60,00,065

6. Smallest number: 20,35,679

Greatest number: 97,65,320

7. 12,20,200           8. 460

9. a. <        b. >

10. a. CCXLIV         b. LVII

11. a. 5,81,72,635     b. 5,59,33,527

12. a. 1                  b. 8,76,54,322

13. 45,59,885; 54,40,115

14. 7,06,185

15. a. 7,25,300       b. 30,84,000

16. a. Q = 143; R = 55

b. Q = 11; R = 130

17. a. 1       b. 3,87,500

c. 97825

18. 648         19. 11

20. 18            21. 11

22. No

23. 11, 13, 17, 19, 23, 29, 31, 37

24. a. Co-primes      b. Not Co-primes

c. Co-primes          d. Co-primes

25. 16 = 5 + 11; 36 = 7 + 29; 42 = 29 + 13; 28 = 11 + 17

26. 45 = 3 × 3 × 5; 121 = 11 × 11; 72 = 2 × 2 × 2 × 3 × 3

27. Yes, divisible     28. Do it yourself

29. Divisible by 3 and 4, and also by 6

30. No           31. 4/3

32. 2/3          33. 8

34. 20            35. 13

36.  24           37. ¾

38. ¼              39. 73/6

40. 6         41. a. 0.9      b. 2.75

42. a. 17/20       b. 21/5

43. a. 41.012, 41.12, 41.21, 411.2

b. 8.07; 8.7, 8.71, 8.8

44. a. 16.7; 15.8, 16.5, 15.3

b. 1.21; 1.2, 1.02, 1.002

45. a. 18.97        b. 58.9

c. 16.479        d. 45.206

46. a. 2.088        b. 2.743

47. 0              48. 94.86835

49. a. 71.2        b. 1315

50. a. 2.532      b. 0.7813

51. 0.074         52. 4740

53. 3600          54. 5620

55. 3800          56. 8310

57. a. 500 g      b. 200 kg

58. a. 21, 28     b. 47, 57

c. 26, 37      d. 500, 25000

59. 276              60. 3136

61. 36 m

62. a. 10 cm     b. 6 m      c. 1.2 m

63. 16 m

64. a. 6 cm      b. 7 m       c. 8 cm

65. 3.75 sq. m

66. 180 cm, 2000 sq. cm

67. 700 sq. cm

68. 150 sq. m, 50 m

69. a. 512 cu. cm       b. 1728 cu. cm

c. 4096 cu. m

70. a. 120 cu. cm      b. 450 cu. cm

71. a. 216 hours     b. 336 hours

c. 584 hours

72. a. 3 days 10 hours

b. 6 days 8 hours

c. 10 days 3 hours

73. a. 6 hours 55 minutes

b. 7 hours 8 minutes

74. a. 95 °F     b. 113 °F    c. 212 °F

75. a. 50 °C     b. 70 °C      c. 80 °C

76. ₹ 540 profit     77. ₹ 500

78. ₹ 140          79. ₹ 1221

80. 300 mangoes

Worksheets for Maths

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