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
- Addition
and subtraction
- Multiplication
- Division
- Shapes
- Patterns
and symmetry
- Perimeter
and area
- Money
- Mental Maths for Class 1
- Mental Maths for Class 2
- Mental Maths for Class 3
- Mental Maths for Class 4
- Mental Maths for Class 5
- Mental Maths for Class 6
- Mental Maths for Class 7
- Mental Maths for Class 8
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: __________
11. Add the following.
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
45. Add the following:
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?
ANSWERS
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
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