Natural Numbers Quiz - CBSE Class 6 Mathematics
Free practice quiz: Natural Numbers (CBSE Class 6 Mathematics). 10 multiple-choice questions with answers and explanations. Play online, no sign-up needed.
This CBSE Class 6 Mathematics practice quiz has 10 multiple-choice questions on Natural Numbers, and 10 of them come with an explanation. Try the 5 sample questions below (tap an option to check yourself), then play the full quiz online. No sign-up needed.
Start quiz: 10 questions, freeLearn the key ideas Beta
What Natural Numbers Are
- Natural numbers are the counting numbers we use to count objects, like 7, 8, 11.
- They have no fractions, decimals or negative signs, and there is no largest natural number.
- Whole numbers are the natural numbers together with zero.
Common mistake: Thinking zero, negative numbers or fractions like a half are natural numbers. Only positive counting numbers are natural numbers.
Sum and Product of First n
- To add the first n natural numbers, use the shortcut formula instead of adding one by one.
- To multiply the first n natural numbers, multiply every counting number up to n.
Common mistake: Mixing up sum and product, or adding when the question asks you to multiply the numbers.
Even Numbers and Divisibility
- Even numbers can be written as 2k. Odd numbers can be written as 2k + 1.
- A number divisible by 2 ends in an even digit.
- Each divisor has its own last-digit rule. Learn the rules from your textbook.
Common mistake: Counting the end numbers when the question says between. Between usually leaves out both end numbers, so check carefully.
LCM of Natural Numbers
- The LCM is the smallest number that is a multiple of all the given numbers.
- List the multiples of each number, or use prime factorisation, and pick the smallest common one.
Common mistake: Choosing the HCF or simply multiplying all the numbers, instead of finding the smallest common multiple.
Turning Words into Equations
- Times as many means multiply. If a friend has x, then k times as many is kx.
- If subtracting a from a number gives b, add a back to b to find it.
Common mistake: Subtracting again instead of adding back when undoing a subtraction, which gives a wrong, smaller answer.
Exam tips
- Check whether between includes the end numbers before you count.
- Put your answer back into the word problem to check it works.
- For a sum of many numbers, use n(n+1)/2 instead of adding one by one.
Beta: made with AI and checked by a second AI. A teacher has not reviewed it yet.
Sample questions
Which of the following is a natural number?
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Answer: C. 3
Natural numbers are positive integers starting from 1. In this case, 3 is a natural number.
What is the sum of the first five natural numbers?
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Answer: A. 15
The first five natural numbers are 1, 2, 3, 4, and 5. Their sum is 1+2+3+4+5 = 15.
What is the product of the first four natural numbers?
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Answer: B. 24
The first four natural numbers are 1, 2, 3, and 4. Their product is 1 × 2 × 3 × 4 = 24.
How many even natural numbers exist between 1 and 20?
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Answer: A. 10
The even natural numbers between 1 and 20 are: 2, 4, 6, 8, 10, 12, 14, 16, 18, and 20 — a total of 10.
You are thinking of a natural number. If you subtract 5 from it and the result is 15, what is the number?
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Answer: A. 20
Let the number be n. Thus, n - 5 = 15. So, n = 15 + 5 = 20.
More questions in this quiz
Answers and explanations are in the full quiz.
- What is the smallest natural number?
- Which number is NOT a natural number?
- A natural number is divisible by 5, what can you say about the last digit?
- John has five times as many natural numbers as his friend. If his friend has x natural numbers, how many does John have?
- What is the least common multiple (LCM) of the first three natural numbers?