CBSE Class 3 Mathematics IMO Olympiad MCQs with Answers Set 20

1. The greatest four digit number that can be formed using 7, 0, 6, 5 without repeating the digits is _______ .
(a) 6570
(b) 7560
(c) 7650
(d) 7065
Answer : (c) The greatest four digit number can be formed using 7, 0, 6, 5 without repeating the digits is 7650.

2. Ritu jogged 350m on Monday. She jogged 170m further on Tuesday than on Monday. How far did she jog altogether on the 2 day?
(a) 520 m
(b) 850 m
(c) 690 m
(d) 870 m
Answer : (d) Ritu jogged on Monday = 350m
She jogged on Tuesday = 350m + 170m = 520m
She jogged altogether = 350m + 520m = 870m

3. Which of the given abacus shows the number greater than 4321 ?

Answer : (b) Abacus in option (b) shows 5231 which is greater than 4321.

4. Madhuri wrote a number on the black board as shown below.

If it is formed from three different digits, then which number could be placed in the gap to make it the biggest number ?
(a) 0
(b) 5
(c) 9
(d) 8
Answer : (d) The biggest number made using defferent digits is 689.

5. Mr. Sharma wrote a 2-digit number on the blackboard. Three students Gopal, Raju and Prashant said the following about that number : 
Gopal : “It is a 2-digit number but not the least”.
Raju : “It is the predecessor of least 3-digit number”.
Prashant:“it is having three different digits”.
What is the number, if only two of the three students said the truth?
(a) 10
(b) 99
(c) 100
(d) 123
Answer : (b) Gopal and Raju said the truth and the 2-digit number is 99.

6. The chart shows the number of eggs produced on a farm in the first five months of the year.

Which of the following statements in true or false?
(A) The number of eggs produced in April was less than in February
(B) The number of eggs produced in May was less than in March
(C) The number of eggs produced in January was less than in March
(D) The number of eggs produced in March was less than in May
(a) TFTF
(b) FTFF
(c) TFFT
(d) FFTF
Answer : (b) Number of eggs produced in
March is 5,879 and May is
5,164.
5, 164 < 5, 879

7. Distance between two districts in Madhya Pradesh is 1000 km. If a bus travelled half of the distance in 10 hrs, how much distance is yet to be covered ?

Answer : (a) The distance yet to be covered 1000/2 km.

8. Look at the number sentence below.
2467 + ☐ = 7121
Which number will make the number sentence true?
(a) 4654
(b) 4256
(c) 4664
(d) 4268
Answer : (a) Given, 2467 + ☐ = 7121
☐ = 7121 –2467 = 4654

9. A ticket to the dolphin show costs ₹ 999 for 1 adult. Which estimate is closest to the total cost of tickets for 3 adults.
(a) ₹ 2000
(b) ₹ 4000
(c) ₹ 3000
(d) ₹ 1000
Answer : (c) A ticket to the dolphin show costs for 1 adult = ₹ 999
Estimated cost of a ticket = ₹1000
∴ A tickets for 3 adults will cost
= 1000 + 1000 + 1000
₹ 3000

10. Roman numeral for 43 is.
(a) XXXIII
(b) XLIII
(c) IVIII
(d) XXXIII
Answer : (c) 43 = 40 + 3 = XL + III = XLIII

11. Meghna has 14 boxes of balls. She has 224 balls in all. Meghna used the number sentence below to find how many balls are in each box.
14 × ☐ = 224
What is the missing number that makes Meghna’s number sentence true ?
(a) 14
(b) 16
(c) 17
(d) 18
Answer : (b) Number sentence = 14 × ☐ = 224
☐ = 224/14
☐= 16

12. Which of the following figure sets shows 1/6 < 4/6 ?

Answer : (a) Figure given in option (a) shows 1/6 < 4/6

13. Sonu likes all numbers which have zeroes at the unit’s place. What is the fraction of such numbers in the given box ?

(a) 15/11
(b) 5/11
(c) 12/11
(d) 3/11
Answer : (b) Total numbers in the given box = 11
Number of zeroes at the unit’s place = 5
Fraction of such numbers in the given box = 5/11

14. Aditi’s flight takes off at 3:30 p.m.
The flight duration is 5 hours 30 minutes. At what time is the flight expected to reach its destination?
(a) 9 : 30 p.m.
(b) 9 : 40 p.m.
(c) 9 : 00 p.m.
(d) 8 : 30 p.m.
Answer : (c) The flight takes off at 3 : 30 p.m.
Flight duration is 5 hours 30 minutes.
∴ The Flight will land at 9 : 00 p.m. (3 : 30 + 5 : 30).

15. Jai and Nihal will paint the circle shown.
· First Jai will paint 2/8 of the circle.
· Then Nihal will paint another 3/8 of the circle. 
Altogether, what fraction of the circle will they paint ?
(a) 5/8
(b) 6/8
(c) 5/16
(d) 6/16
Answer : (a) Fraction of circle painted by Jai = 2/8
Fraction of circle painted by Nihal = 3/8
Fraction of circle will be painted by both of them = 2/8 + 3/8 = 5/8 .

16. Rahul has ₹ 1120.50. He wants to buy a Robot that costs ₹ 2080.75. How much more does he need to buy the Robot ?
(a) ₹ 850.75
(b) ₹ 950.75 ₹ 2080
(c) ₹ 960.25
(d) ₹ 890.25
Answer : (c) Rahul has money = `₹1120.50
The cost of Robot = ₹ 2080.75
Rahul needs = ₹ 2080.75
– ₹ 1120.50 = ₹ 960.25

17. Sanjay bought 16 packets of ice cream bricks for a party. The total cost for bricks was ₹ 6400. How he will calculate the cost of 1 ice cream brick ?
(a) 16 ¸ 6400
(b) (6400 ¸ 16)
(c) (6000 ¸ 16)
(d) None of these
Answer : (b) The cost of 16 packets of icecream bricks = ₹ 6400
∴ The cost of 1 ice-cream brick
= ₹ (6400¸16)

18. Hindu - Arabic numeral for XLIX is
(a) 71
(b) 69
(c) 49
(d) 61
Answer : (c) XLIX = XL + IX = 40 + 9 = 49

19. You have ₹ 500. How much money will be left with you if you buy 2 ice creams, 2 milky bars, one pen and one burger ?

(a) ₹ 150
(b) ₹ 185
(c) ₹ 175
(d) ₹ 155
Answer : (d) Cost of 2 ice creams = 2 × 55 = ₹ 110
Cost of 2 milky bars = 2 × 25 = ₹ 50
Cost of 1 pen = 1 × 75 = ₹ 75
Cost of 1 burger = 1 × 110 = ₹ 110
Total money spent = 110 + 50 + 75 + 110 = ₹ 345
Money left = ₹ 500 – ₹ 345 = ₹ 155.

20. Dia saves ₹ 51.50 everyday from her pocket money. How much does she save in 9 days ?
(a) ₹ 463.50
(b) ₹ 416.50
(c) ₹ 520.00
(d) ₹ 461.5
Answer : (a) Dia saves money in one day = ₹ 51.50
She saves in 9 days = 9 × ₹ 51.50
= ₹ 463.50

21. Simran has a rope of length 45 m.
She cuts it into 5 equal pieces. How long is each piece of rope ?
(a) 19 m
(b) 9 m
(c) 10 m
(d) 11 m
Answer : (b) Total length of rope = 45 m
Number of piece cut by simran = 5
Length of one piece = 45/5 = 9m

22. The chart shows the number of pages Lalita read during four days.

How many more pages did she read on Wednesday than on Tuesday ?
(a) 15
(b) 14
(c) 12
(d) 26
Answer : (b) Lalita read on Wednesday = 31 pages
She read on Tuesday = 17 pages Now,
Difference 31 – 17 = 14 pages
Lalita read 14 pages more on
Wednesday than on Tuesday.

23. Which of the following fractions are arranged in descending order?
(a) 11/15, 11/9, 11/13
(b) 11/9, 11/13, 11/15
(c) 11/15, 11/13, 11/9
(d) 11/9, 11/9, 11/13
Answer : (b) Number of the fractions are same.
∴ 11/9 > 11/13 > 11/15

24. This is a cuboid 

How many of these cuboids are needed to make the figures shown below ?
(a) 19
(b) 18
(c) 12
(d) 16
Answer :

25. Which could be one of the faces of a cylinder ?

Answer : (c) Circle is the base of cylinder.

26. Which of the following has 2 lines of symmetry?

27. The table shows the amount of time aKomal spent on skating.
Day                 Practice Time
Monday          30 minutes
Tuesday         45 minutes
Wednesday    60 minutes
Thursday        75 minutes
Friday             90 minutes
Saturday                ?
If the pattern in the table continues, how many minutes will she spend practicing on Saturday ?
(a) 105 mins
(b) 110 mins
(c) 100 mins
(d) 95 mins
Answer : (a) The difference between the minutes of practicing per day = 15 minutes.
So, she will spend 105 mins in practicing on Saturday.

28. Look at the pattern of shapes on this section of wallpaper.

Which of the following would continue the pattern shown?

Answer : (d) Pattern given in option (d) will be continued.

29. Look at this pattern of shapes.

Which of these shows the same kind of pattern?

30. Match the following columns.
Column - I             Column - II
(Solid Shape)    (Number of Faces)
(A) Sphere                 (1) 2
(B) Cuboid                 (2) 3
(C) Cone                    (3) 6
(D) Cylinder               (4) 1
     A B C D
(a) 4 3 1 2
(b) 3 4 2 1
(c) 3 2 4 1
(d) 4 1 3 2
Answer : (a) (A) → 4, (B) → 3,(C) → 1,(D) → 2

31. The first five numbers in a pattern are shown below. A subtraction rule was used to find each new number in the pattern.
125 105 85 65 45 ?
If the subtraction pattern is continued in the same way, what be the next number in the pattern ?
(a) 44
(b) 35
(c) 25
(d) 46
Answer : (c)

32. Consider the following statements.
Statement 1: The largest 4 - digit number formed by using the digits 6, 5 and 4 and using 6 twice is 6654.
Statement 2: 999 is predecessor of smallest four digit number.
Now, choose the correct option.
(a) Statement - 1 is true and 2 is false.
(b) Statement - 1 is false and 2 is true.
(c) Both statements 1 and 2 are true.
(d) Both statements 1 and 2 are false.
Answer : (c) Both statements 1 and 2 are true

DIRECTIONS (Qs. 33 to 34): The following table shows number of buttons of different colour used in a school project by Amit.

33. How many more blue buttons were used than pink buttons?
(a) 14
(b) 3
(c) 11
(d) 4
Answer : (b) Number of blue buttons used = 14
Number of pink buttons used = 11
Number of more blue buttons used = 14 – 11 = 3

34. How many less orange buttons were used than green buttons?
(a) 4
(b) 3
(c) 8
(d) 5
Answer : (d) Number of orange buttons used = 8
Number of green buttons used = 13
Number of less orange buttons used = 13 – 8 = 5

35. Ralph and Kim are talking about some large number they are studying in the Math class, which is 1000 more than 5529. Which of the following is the number ?
(a) 6539
(b) 6529
(c) 6549
(d) 5539
Answer : (b) The number 100 more than 529 = 529 + 100 = 629.