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CBSE Class 6  >  Class 6 Test  >  Maths Olympiad   >  Olympiad Test: Whole Numbers - Class 6 MCQ

Olympiad Test: Whole Numbers - Free MCQ with solutions Class 6 Maths


MCQ Practice Test & Solutions: Olympiad Test: Whole Numbers (20 Questions)

You can prepare effectively for Class 6 Maths Olympiad Class 6 with this dedicated MCQ Practice Test (available with solutions) on the important topic of "Olympiad Test: Whole Numbers". These 20 questions have been designed by the experts with the latest curriculum of Class 6 2026, to help you master the concept.

Test Highlights:

  • - Format: Multiple Choice Questions (MCQ)
  • - Duration: 20 minutes
  • - Number of Questions: 20

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Olympiad Test: Whole Numbers - Question 1
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The whole number which does not have a predecessor in the whole number system is

Detailed Solution: Question 1

  • Whole numbers start from 0 and go on as 0, 1, 2, 3, …
  • A predecessor means the number just before another in this sequence.
  • 0 is the very first whole number.
  • Since there’s no number before 0, it has no predecessor.
  • Every other option (1, 2, etc.) has a preceding number.
  • Hence, 0 is the whole number without a predecessor.

Olympiad Test: Whole Numbers - Question 2
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The predecessor of the smallest 4-digit number is

Detailed Solution: Question 2

The smallest four-digit number is 1000. Therefore, its predecessor is 1000 - 1 = 999.

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Olympiad Test: Whole Numbers - Question 3
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The predecessor of 1 million is

Detailed Solution: Question 3

1 million is written as 1,000,000. Its predecessor is 1,000,000 − 1 = 999,999.

Olympiad Test: Whole Numbers - Question 4
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The product of the predecessor and the successor of the greatest 2-digit number is

Detailed Solution: Question 4

The greatest 2-digit number is 99. Its predecessor is 98, and its successor is 100. The product is 98 × 100 = 9800.

Olympiad Test: Whole Numbers - Question 5
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The sum of the successor of the greatest 3-digit number and the predecessor of the smallest 3-digit number is

Detailed Solution: Question 5

Answer: a) 1099

  • Greatest 3-digit number = 999 → its successor (next number) = 1000

  • Smallest 3-digit number = 100 → its predecessor (just before) = 99

  • Sum = 1000 + 99 = 1099

So the correct option is 1099.

Olympiad Test: Whole Numbers - Question 6
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The number of whole numbers between 22 and 54 is

Detailed Solution: Question 6

Whole numbers between 22 and 54 range from 23 to 53. The count is calculated as 53 − 23 + 1 = 31.

Olympiad Test: Whole Numbers - Question 7
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The number of whole numbers between the smallest whole number and the greatest 2-digit number is

Detailed Solution: Question 7

To find the number of whole numbers between the smallest whole number and the greatest 2-digit number, we can follow these steps:

  • The smallest whole number is 0.
  • The greatest 2-digit number is 99.
  • To find the numbers between 0 and 99, we count from 1 to 98.
  • This gives us a total of 98 whole numbers.

Therefore, the number of whole numbers between the smallest whole number and the greatest 2-digit number is 98.

.

Olympiad Test: Whole Numbers - Question 8
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If a is a whole number such that a + a = a, then what is a?

Detailed Solution: Question 8

Only when a = 0 does the equation a + a = a hold true because 0 + 0 = 0.

Olympiad Test: Whole Numbers - Question 9
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The value of (93 × 63 + 93 × 37) is

Detailed Solution: Question 9

Using the distributive property, we factor out 93 from both terms:

  • 93 × (63 + 37)
  • = 93 × 100
  • = 9300.

Olympiad Test: Whole Numbers - Question 10
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Which of the following is not equal to zero?

Detailed Solution: Question 10

(5 − 0) ÷ 5 = 5 ÷ 5 = 1, which is not zero.

(10 − 10) ÷ 5 = 0 ÷ 5 = 0.

0 ÷ 5 = 0.

0 × 5 = 0.

Only option A is not zero; therefore the correct answer is A.

Olympiad Test: Whole Numbers - Question 11
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Which of the following statement is true?

Detailed Solution: Question 11

Whole numbers are non-negative integers (e.g., 0, 1, 2, ...).

  • For option A: 13 - 21 = -8, which is not a whole number. Therefore, statement A is true.
  • Option B: 21 × 1 = 21 and 21 × 0 = 0. Since 21 ≠ 0, statement B is false.
  • Option C: 21 - 13 = 8, which is a whole number. Therefore, statement C is false.
  • Option D:
    • Left side: 21 - (13 - 5) = 21 - 8 = 13;
    • Right side: (21 - 13) - 5 = 8 - 5 = 3.
    Since 13 ≠ 3, statement D is false.

Thus, the correct answer is A.

Olympiad Test: Whole Numbers - Question 12
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On dividing a number by 9, we get 47 as the quotient and 5 as the remainder. The number is

Detailed Solution: Question 12

Using the formula
Number = Divisor × Quotient + Remainder,
Number = 9 × 47 + 5
First, multiply 9 by 47:
9 × 47 = 423
Then add the remainder: 423 + 5 = 428
Therefore, the number is 428.

Olympiad Test: Whole Numbers - Question 13
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Number of whole numbers between 38 and 68 is

Detailed Solution: Question 13

Number of whole numbers between 38 and 68:

To find the total number of whole numbers between 38 and 68, follow these steps:

  • Identify the range: The numbers start from 39 (the first whole number after 38) to 67 (the last whole number before 68).
  • Count the numbers: Use the formula last number - first number + 1.
  • Calculate: 67 - 39 + 1 = 29.

Thus, there are a total of 29 whole numbers between 38 and 68.

Olympiad Test: Whole Numbers - Question 14
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5 added to the smallest 6-digit number gives

Detailed Solution: Question 14

The smallest 6-digit number is 100000. Adding 5 to this number results in:

  • 100000 + 5 = 100005

Therefore, the correct answer is D.

Olympiad Test: Whole Numbers - Question 15
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When 578 is subtracted from the smallest 5-digit number, we get

Detailed Solution: Question 15

The smallest 5-digit number is 10000.

Subtracting 578 from 10000 
10000 − 578 = 9422.

Therefore the correct option is A (9422).

Olympiad Test: Whole Numbers - Question 16
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The successor of 100199 is

Detailed Solution: Question 16

The successor of a number is obtained by adding 1 to it. Therefore:

  • 100199 + 1 equals 100200.

Olympiad Test: Whole Numbers - Question 17
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Which of the following is the largest 3-digit number?

Detailed Solution: Question 17

The largest 3-digit number is 999 because adding 1 results in 1000, a 4-digit number.

Olympiad Test: Whole Numbers - Question 18
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Which of the following is the smallest whole number?

Detailed Solution: Question 18

Whole numbers include all non-negative integers starting from 0. They are defined as:

  • 0
  • 1
  • 2
  • 3
  • 4
  • 5
  • and so on.

This makes 0 the smallest whole number.

Olympiad Test: Whole Numbers - Question 19
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The product of the successor and predecessor of the smallest 2-digit number is

Detailed Solution: Question 19

The smallest 2-digit number is 10. Its predecessor is 9, and successor is 11. The product is 9×11=99.

Olympiad Test: Whole Numbers - Question 20
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The difference between the greatest 4-digit number and the smallest 3-digit number is:

Detailed Solution: Question 20

  • The greatest 4-digit number = 9999
  • The smallest 3-digit number = 100

Now find the difference:

9999−100=98999999 - 100 = 98999999−100=9899

Therefore, the correct answer is 9899.

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About this Class 6 Practice Test

This test contains 20 MCQs on Olympiad Test: Whole Numbers with detailed solutions for each question. It is part of the Maths Olympiad Class 6 course on EduRev, designed to align with the current Class 6 syllabus. Each solution explains not just the correct answer but also gives you an understanding of the topic — not just to attempt the question but also help you prepare for the exam with practice.

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