CBSE Class 3 Mathematics IMO Olympiad MCQs with Answers Set 18

1. The number represented by given abacus is :

(a) 1999
(b) 1987
(c) 9991
(d) 9998
Answer : (a) The abacus represents 1 × thousands + 9 hundreds + 9 tens + 9 ones
= 1 × 1000 + 9 × 100 + 9 × 10 + 9 = 1999.

2. The number 5843 has ___________ thousands.
(a) 15
(b) 12
(c) 5
(d) 6
Answer : (c) Given number = 5843
= 5 × 1000 + 8 × 100 + 4 × 10 + 3
The number 5843 has 5 thousands.

3. The greatest 3-digit number among the following is :
(a) 987
(b) 123
(c) 999
(d) 111
Answer : (c) The greatest three digit number is 999.

4. What number replaces question mark to make the number sentence true ?
8540 – ? = 6324
(a) 2238
(b) 6422
(c) 2422
(d) 2216
Answer : (d) The number sentence
8540 – ? = 6324 ? = 8540 – 6324 ? = 2216.

5. Kashi has 4888 balloons. Vivek has 4777 balloons. How many balloons are there in all?
(a) 9665
(b) 4978
(c) 9666
(d) 9555
Answer : (a) Number of balloons Kashi has = 4888
Number of balloons Vivek has = 4777
Total number of balloons = 4888 + 4777 = 9665.

6. The table below shows the number of students in a school.
Number of students in a School
Year      Number of students
1970               3425
1980               5348
1990               5561
2000               6324
What was the increase in number of students from the year 1970 to the year 1990 ?
(a) 8986
(b) 2136
(c) 1598
(d) 1896
Answer : (b) Population of year 1970 = 5 crores
Population of year 1990 = 18 crores Increase in population from year 1970 to the year 1990
= 18 – 5 = 13 crores.

7. Δ + = 10
☐ - Δ = 2
(The two number sentences shown above are true.)
Which of the following values for Δ and ☐ make both number sentences true ?
(a) ☐ = 6, Δ = 4
(b) ☐ = 8, Δ = 2
(c) ☐ = 7, Δ = 3
(d) ☐ = 8, Δ = 6
Answer :

8. Write a multiplication sentence for the following figure ?

(a) 7 × 3 = 21
(b) 7 + 3 = 10
(c) 7 × 10 = 70
(d) 3 + 3 + 3 = 9
Answer : (a) Number of bowls = 3
Number of apples in each bowl = 7
So, number sentence = 7 × 3 = 21.

9. If 200 ÷ 4 = 50
300 ÷ 6 = 50
400 ÷ 8 = 50
_ _ _ _ _ _ _ _ _
_ _ _ _ _ _ _ _ _
then, 1000 ÷ 20 = ________ .
(a) 100
(b) 50
(c) 30
(d) 20
Answer : (b) 1000 ¸ 20 = 50

10. Which of the following is wrong ?
(a) 165 ¸ 5 is less than 165 × 0.
(b) 534 ¸ 6 is greater than 40 × 2.
(c) 5 × 70 = 70 + 70 + 70 + 70 + 70
Answer : (d) 9563 – 5369 = 4000 + 100 + 90 + 4
(a) 165 ¸ 5 = 33 and 165 × 0 = 0
33 > 0.

11. When 1978 is divided by 8, the quotient and the remainder are respectively ________ .
(a) 122, 8
(b) 220, 10
(c) 247, 2
(d) 122, 9
Answer : (c) 1978 ¸ 8 = quotient 247 + remainder 2.

12. Which list of the fractions is arranged from the smallest to the largest ?
(a) 1/8, 1/4, 1/2
(b) 1/2, 1/4, 1/8
(c) 1/4, 1/3, 1/8
(d) 1/2, 1/8, 1/4
Answer : (a) Numerator of the fractions is same.
So, the correct arrangement is 1/8, < 1/4, < 1/2

13. Complete the pattern : 13, 20, 27, 34 ________ .
(a) 7
(b) 41
(c) 31
(d) 9
Answer : (b) 13 + 7 = 20, 20 + 7 = 27, 27 + 7 =34, 34 + 7 = 41

14. Which of the following fractions is least?
(a) 1/2
(b) 1/5
(c) 1/7
(d) 1/9
Answer : (d) Since, numerator of the fractions is same. So, the larger is the denominator, the smaller is the number.
Here, 9 > 7 > 5 > 2.
The correct option is (d).

15. Saumya saves ₹ 225 every month.
Find her total savings for the year.
(a) ₹ 2200
(b) ₹ 2250
(c) ₹ 1750
(d) ₹ 2700
Answer : (d) Saumya saves every month = ₹ 225
She saves in 12 months = ₹ 225 × 12 = ₹ 2700

16. In India, the unit of currency is:
(a) paise
(b) dollar
(c) rupee
(d) None of these
Answer : (c) In India, the unit of currency is rupee.

17. If 5 pens cost ₹ 425. What is the cost of 1 pen ?
(a) 65 rupees
(b) 75 rupees
(c) 80 rupees
(d) 85 rupees
Answer : (d) cost of 5 pens = ₹ 425
∴ cost of 1 pen = 425/5 = ₹ 85

18. The football game began at 11:25 a.m. It finished after 3 hours. What time did the game finished?
(a) 8 : 25 a.m
(b) 2 : 00 a.m
(c) 2 : 25 p.m
Answer : (d) 1 : 25 p.m

19. Consider the following statements.
Statement - I: Tally marks for 29 is

Statement - II: Tally marks is the representation of data with the help of a group of lines.
Now, choose the correct option.
(a) Statement I is true and II is false.
(b) Statement I is false and II is true.
(c) Both statements I and II is true.
(d) Both statements I and II are false.
Answer : (c) Both statements are true.

20. How many minutes are there in one day?
(a) 1440
(b) 86400
(c) 76000
(d) 2440
Answer : (a) 1 day = 1 × 24 hours
= 1 × 24 × 60 minutes
= 1440 minutes

21. Match the columns:
Column - I           Column - II
Solid figure     Number of edges
(A) Cone                  (1) 12
(B) Cube                  (2) 0
(C) Cylinder              (3) 1
(D) Sphere               (4) 2
     A B C D
(a) 1 3 2 4
(b) 3 1 4 2
(c) 4 2 3 1
(d) 3 4 1 2
Answer : (b) (A)  → 3,(B) → 1,(C) → 4,(D) → 2

22. The minutes hand takes ________ rotations to move hour hand from 3 to 9.
(a) 6
(b) 10
(c) 20
(d) 30
Answer : (a) The minutes hand takes 1 rotation to complete 1 hour. So, it will take 6 rotations to move hour hand from 3 to 9.

23. Each ☐ weighs 1kg. How much does the sum of following figures weigh ?

(a) 16 kg
(b) 12 kg
(c) 9 kg
(d) 25 kg
Answer : (d) Weight of each ☐ = 1 kg
So, 9 kg + 16 kg = 25 kg.

24.

(a) 1250 ml
(b) 10250 ml
(c) 1150 ml
(d) 1550 ml
Answer : (a) 1 litre = 1000 ml
So, 1000 ml + 250 ml
= 1250 ml

25. Which of the following statements is true about a cuboid?
(a) A cuboid has 6 faces
(b) A cuboid has 8 vertices
(c) A cuboid has 4 edges
(d) Both (a) and (b)
Answer : (d) A cuboid has 6 faces and 8 vertices.

26. Observe the following diagrams and answer the question given below :

Which shape is made of curved line only ?
(a) Circle
(b) Hexagon
(c) Pentagon
(d) Octagon
Answer : (a) circle is made of curved line only.

27. This pictograph displays 3rd grade students favourite sports 

Sports played by 3rd Graders

Which is the most popular sport ?
(a) Baseball
(b) Football
(c) Soccer
(d) Basketball
Answer : (c) According to pictograph 60 students played soccer. So, the most popular sport is soccer.

28. The pictograph shows the number of fish in four houses.
Number of fish in neighbouring houses

How many more fish does house-2 have than house-3 ?
(a) 4
(b) 3
(c) 2
(d) 1
Answer : (b) House - 2 has number of fish = 13
House - 3 has number of fish = 10
Number of fish in house - 2 more than house = 3
= 13 – 10 = 13

29. This pictograph displays favourite colours of class III students?

Which is the most favourite colour of students ?
(a) Red
(b) Blue
(c) Green
(d) Purple
Answer : (d) Purple is the most favorite colour of class III students.

30. Which of the following is equal to 104 × 50 ?
(a) (100 × 5) + (4 × 5)
(b) (100 × 5) + (4 × 50)
(c) (100 × 50) + (40 × 50)
(d) (100 × 50) + (4 × 50)
Answer : (d) 104 × 50 = (100 + 4) × 50 = (100 × 50) + (4 × 50).

31. Anupama divided 498 by 8 and obtained a quotient of 62 and remainder 2. For this problem, which of these checks will help Anupama to find out her mistakes?
(a) check if quotient × divisor + remainder = dividend
(b) check the calculation of 8 × 6 and 8 × 2
(c) check if remainder < quotient
(d) check if remainder < dividend
Answer : (a) The correct check is quotient × divisor + remainder = dividend.

32. How many triangles can be seen in this drawing ?

(a) 3
(b) 5
(c) 6
(d) 7
Answer : (b) There are 5 triangles in the given drawing.

33. Statement whether the statements are True or False:
(a) The standard unit of length is metre.
(b) The standard unit of measuring weight is gram.
(c) The standard unit of measuring volume of liquid is litre.
(d) Millelitre is written as cm.
(a) TTFF
(b) TFTF
(c) TFFT
(d) FTTF
Answer : (c) The standard unit of measuring weight is kilogram. millilitre is written as ml.

34. Convert 2050 ml to litre and ml
(a) 20 l 50 ml
(b) 200 l 5 ml
(c) 2 l 50 ml
(d) 2 l 500 ml
Answer : (c) 2050 ml = 2000 ml + 50 ml = 2150 ml

35. Madhavi glued 4 white cubes together as shown below. Thus she painted the entire figure red.

How many faces of the 4 cubes were painted red ?
(a) 4
(b) 9
(c) 18
(d) 24
Answer : (c) 18 faces of the 4 cubes were painted red.