Playing With Numbers (IMO- Mathematics Olympiad (SOF) Class 6): Questions 9 - 18 of 86

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Question number: 9

» Playing With Numbers

MCQ▾

Question

The two numbers nearest to 2000 which are exactly divisible by each of 2, 3, 4, 5 and 6 is

Choices

Choice (4) Response

a.

1970, 2220

b.

1969, 2220

c.

1860, 2220

d.

1940, 2220

Question number: 10

» Playing With Numbers

MCQ▾

Question

Which of the following is not a perfect cube?

Choices

Choice (4) Response

a.

27

b.

342

c.

512

d.

216

Question number: 11

» Playing With Numbers

MCQ▾

Question

The numbers which are multiplies of 2 are called________.

Choices

Choice (4) Response

a.

Even

b.

Composite

c.

Odd

d.

Prime

Question number: 12

» Playing With Numbers

MCQ▾

Question

The smallest value of ‘x’ in the number 156x0 so that it is divisible by10 is:

Choices

Choice (4) Response

a.

1

b.

2

c.

0

d.

All a. , b. and c. are correct

Question number: 13

» Playing With Numbers

MCQ▾

is divisible by

Choices

Choice (4) Response

a.

3

b.

11

c.

7

d.

9

Question number: 14

» Playing With Numbers

MCQ▾

Question

The least number which when increased by 6 is exactly divisible by 12, 24 and 48 is

Choices

Choice (4) Response

a.

42

b.

23

c.

54

d.

36

Question number: 15

» Playing With Numbers

MCQ▾

Question

The reciprocal of the smallest prime is

Choices

Choice (4) Response

a.

1

b.

2

c.

d.

0

Question number: 16

» Playing With Numbers

MCQ▾

Question

Which of the following is a perfect square?

Choices

Choice (4) Response

a.

68

b.

56

c.

48

d.

49

Question number: 17

» Playing With Numbers

MCQ▾

Question

Which of the following is the pair of twin primes?

Choices

Choice (4) Response

a.

(5, 11)

b.

(7, 11)

c.

(17, 19)

d.

(19, 23)

Question number: 18

» Playing With Numbers

MCQ▾

Question

The HCF of two numbers is 54. If one number is 27 and another is 162, then the LCM is

Choices

Choice (4) Response

a.

31

b.

85

c.

51

d.

81

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