# Number Systems (IMO- Mathematics Olympiad Class 6): Questions 51 - 55 of 84

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## Question number: 51

» Number Systems

MCQ▾

### Question

Rohan’s monthly salary is Rs. 18000. He spends Rs. 2050 for his home expenses, Rs. 1590 for purchasing clothes, Rs. 870 for purchasing groceries, milk, etc. , Rs. 1900 for purchasing medicine and pays a rent of Rs. 4500 in a particular month. How much does he save in this month?

### Choices

Choice (4) Response

a.

Rs. 7090

b.

Rs. 8609

c.

Rs. 7050

d.

Rs. 6870

## Question number: 52

» Number Systems

MCQ▾

### Question

Product of two integer is If one of the integers is , then the other is

### Choices

Choice (4) Response

a.

19

b.

1

c.

0

d.

-9

## Question number: 53

» Number Systems

MCQ▾

### Question

The expression is equivalent to, uses the ________ property.

### Choices

Choice (4) Response

a.

Associative

b.

Closure

c.

Identity

d.

Commutative

## Question number: 54

» Number Systems

MCQ▾

### Question

Multiply the unit’s place of the number obtained by reversing the digits of the number 78923 with the hundred’s place of the number obtained by interchanging the digits in the unit’s place and the thousand’s place of the same number, we get________.

### Choices

Choice (4) Response

a.

54

b.

64

c.

16

d.

63

## Question number: 55

» Number Systems

MCQ▾

### Question

Subtract the number obtained by reversing the digits of the number 20198 from the number obtained by interchanging the digits in the unit’s place and the hundred’s place of the same number, we get________.

### Choices

Choice (4) Response

a.

77121

b.

- 68229

c.

68004

d.

- 68211

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