Chapter 1 · Class 6 ICSE · MCQ Test
Number System MCQ Test — Class 6 ICSE
Practice 10 multiple-choice questions with instant answer reveal and explanations.
Number System — MCQ Questions
1Which of the following is the smallest natural number?
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Answer: 1
Hint: Natural numbers start from 1 and go on forever.
Solution:
Natural numbers are counting numbers: 1, 2, 3, 4, ...
The smallest natural number is 1. Note that 0 is a whole number but not a natural number.
2Which of the following is NOT a whole number?
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Answer: −3
Hint: Whole numbers include 0 and all natural numbers. They are never negative.
Solution:
Whole numbers are: 0, 1, 2, 3, 4, ...
−3 is a negative number and is NOT a whole number.
3What is the place value of 7 in the number 4,73,562?
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Answer: 70,000
Hint: Identify the place (ones, tens, hundreds, thousands, ten-thousands, lakhs) where 7 sits.
Solution:
In 4,73,562, the digit 7 is in the ten-thousands place.
Place value = digit × value of its place: — 7 × 10,000 = 70,000
4Write the number 35,672 in expanded form.
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Answer: 30,000 + 5,000 + 600 + 70 + 2
Hint: Multiply each digit by the value of its place (ones, tens, hundreds, thousands, ten-thousands).
Solution:
Break the number by place values:
3 is in ten-thousands, 5 in thousands, 6 in hundreds, 7 in tens, 2 in ones. — 30,000 + 5,000 + 600 + 70 + 2
5What is the successor of 9,999?
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Answer: 10,000
Hint: The successor of a number is the number that comes right after it (add 1).
Solution:
Successor means the next number.
Add 1: — 9,999 + 1 = 10,000
6What is the predecessor of 5,000?
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Answer: 4,999
Hint: The predecessor of a number is the number just before it (subtract 1).
Solution:
Predecessor means the number just before.
Subtract 1: — 5,000 − 1 = 4,999
7How many 4-digit numbers are there in all?
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Answer: 9,000
Hint: The smallest 4-digit number is 1,000 and the largest is 9,999. Count how many numbers lie between them (inclusive).
Solution:
Smallest 4-digit number = 1,000; Largest = 9,999
Total count: — 9,999 − 1,000 + 1 = 9,000
8In the Indian system, how is 1,23,45,678 read?
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Answer: One crore twenty-three lakh forty-five thousand six hundred seventy-eight
Hint: In the Indian system, the places after thousands are ten-thousands, lakhs, ten-lakhs, and crores.
Solution:
Using Indian place value: 1 crore, 23 lakh, 45 thousand, 678.
Read as: One crore twenty-three lakh forty-five thousand six hundred seventy-eight.
9What is the face value of 6 in the number 3,64,210?
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Answer: 6
Hint: Face value of a digit is the digit itself, regardless of its position.
Solution:
Face value is the digit itself, no matter where it is placed in the number.
The face value of 6 is simply 6.
10Which is the largest 5-digit number?
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Answer: 99,999
Hint: The largest 5-digit number has 9 in every place.
Solution:
A 5-digit number ranges from 10,000 to 99,999.
The largest 5-digit number is 99,999.
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Tips for Number System MCQs
- 1Read each question carefully and identify what is being asked before looking at the options.
- 2Try to solve the problem mentally or on paper first, then match your answer with the options.
- 3Use elimination — rule out clearly wrong options to improve your chances even when unsure.
- 4Check units, signs, and edge cases — these are common traps in Number System MCQs.
- 5Review your mistakes after completing the test to build lasting understanding.
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