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Olympiad Test: Number System - 1 - Class 7 MCQ


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20 Questions MCQ Test Mathematics Olympiad Class 7 - Olympiad Test: Number System - 1

Olympiad Test: Number System - 1 for Class 7 2024 is part of Mathematics Olympiad Class 7 preparation. The Olympiad Test: Number System - 1 questions and answers have been prepared according to the Class 7 exam syllabus.The Olympiad Test: Number System - 1 MCQs are made for Class 7 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Olympiad Test: Number System - 1 below.
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Olympiad Test: Number System - 1 - Question 1

Which of the following is the least part if 128 is divided into four parts proportional to 4, 7, 9 and 12.

Detailed Solution for Olympiad Test: Number System - 1 - Question 1

Numbers proportional to 4, 7, 9 and 12 are 4x ,7x, 9x, 12x respectively.
4x + 7x + 9x + 12x =128
32x = 128
x = 4
4x =16

Olympiad Test: Number System - 1 - Question 2

Select the number which is not prime.

Detailed Solution for Olympiad Test: Number System - 1 - Question 2

201 is divisible by 3. So, it is not a prime number.

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Olympiad Test: Number System - 1 - Question 3

What is the value of the given expression: (125 × 56) = ?

Detailed Solution for Olympiad Test: Number System - 1 - Question 3

(125 × 56) = 53 × 56 = 53+6

Olympiad Test: Number System - 1 - Question 4

What smallest number must be added to 6036, so that the sum is completely divisible by 14?

Detailed Solution for Olympiad Test: Number System - 1 - Question 4


Required number = (14 – 2) = 12

Olympiad Test: Number System - 1 - Question 5

If there are two odd numbers say x and y, then which of the following expression is even?

Detailed Solution for Olympiad Test: Number System - 1 - Question 5

The sum of two odd numbers is even. So, x + y is even.

Olympiad Test: Number System - 1 - Question 6

What is the value of given number sentence? 144 × 362 ÷ 432 =?

Detailed Solution for Olympiad Test: Number System - 1 - Question 6

144 × 362 ÷ 432 = 144 × 1296 ÷ 432
= 144 × 3  = 432

Olympiad Test: Number System - 1 - Question 7

Solve the following:
43729 × 999 = ?

Detailed Solution for Olympiad Test: Number System - 1 - Question 7

43729 × 9999 = 43729 × (1000 – 1)
= 43729 × 1000 – 43729 × 1
= 43729000 – 43729
= 436 85271

Olympiad Test: Number System - 1 - Question 8

Which of the following is the smallest whole number if the number 418 * 342 is completely divisible by 3?

Detailed Solution for Olympiad Test: Number System - 1 - Question 8

Sum of digits = (4 + 1 + 8 + x + 3 + 4 + 2) =
(22 + x), which must be divisible by 3.
∴ x = 2

Olympiad Test: Number System - 1 - Question 9

Choose the correct number that can replace the question mark (?).
(?) – 18637 – 23994 = 9977

Detailed Solution for Olympiad Test: Number System - 1 - Question 9

(?) – 18637 – 23994 = 9977 
(?) = 9977 + 18637 + 23994
= 52608

Olympiad Test: Number System - 1 - Question 10

Which of the following is the largest 3-digit prime number?

Detailed Solution for Olympiad Test: Number System - 1 - Question 10

997 is the largest 3- digit prime number.

Olympiad Test: Number System - 1 - Question 11

Choose the number which is not prime number?

Detailed Solution for Olympiad Test: Number System - 1 - Question 11

627 is divisible by 3. Hence it is not a prime number.

Olympiad Test: Number System - 1 - Question 12

How many prime numbers exist between 400 and 500?

Detailed Solution for Olympiad Test: Number System - 1 - Question 12

Prime numbers between 400 and 500 are:
401    409     419    421    431    433    439    443 
449    457    461    463    467    479    487    491    
499

Olympiad Test: Number System - 1 - Question 13

The sum of 65 natural number is:

Detailed Solution for Olympiad Test: Number System - 1 - Question 13

Sum of all the first n natural numbers

Olympiad Test: Number System - 1 - Question 14

How many prime numbers are less than 40?

Detailed Solution for Olympiad Test: Number System - 1 - Question 14

Prime numbers less than 40 are:
2      3      5      7     11     13     17     19     23    29     31     37

Olympiad Test: Number System - 1 - Question 15

The algebraic expression 73n– 42n has a factor:

Detailed Solution for Olympiad Test: Number System - 1 - Question 15

73n – 42n = (73) n – (42) n
= (343)n – (16)n
Thus 343 – 16 is a factor i.e. 327 is a factor of 73n – 42n

Olympiad Test: Number System - 1 - Question 16

Which of the following rational numbers should be subtracted from 4/5to get 0.5?

Detailed Solution for Olympiad Test: Number System - 1 - Question 16

4/5 = 0.8
Hence, required number = 0.8 – 0.50  = 0.3

Olympiad Test: Number System - 1 - Question 17

The additive inverse of 7.22 is added to the additive identity of 3.6. What is the sum obtained?

Detailed Solution for Olympiad Test: Number System - 1 - Question 17

Additive inverse of 7.22 = – 7.22
Additive identity of 3.6   = 0
Hence, sum of – 7.22 and 0 = – 7.22

Olympiad Test: Number System - 1 - Question 18

The multiplicative inverse of  is added to the additive inverse of  . Find the sum.

Detailed Solution for Olympiad Test: Number System - 1 - Question 18

Multiplicative inverse of 

Olympiad Test: Number System - 1 - Question 19

1/5 is first taken away from 1.5 and then 6/5 is added to the result. Which of the following is the new rational number obtained?

Detailed Solution for Olympiad Test: Number System - 1 - Question 19



Olympiad Test: Number System - 1 - Question 20

The rational number 3.78 is increased by 1/5 and then  is subtracted from the result. Find the new rational number.

Detailed Solution for Olympiad Test: Number System - 1 - Question 20

[{(3.78 + 1/5) - 2} - 1/4]

=> {(3.98) - 2} - 1/4

=> 1.98 - 1/4

=> 1.73

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