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Important Questions Class 8 Mathematics Chapter 16 – Playing With Numbers
Mathematics requires analytical thinking and problemsolving skills. One should do lots of practice and develop a deep understanding of the concepts of the subject in order to excel in Mathematics.
Chapter 16 of Class 8 Mathematics is about Playing with Numbers. The important topics covered in this chapter are:
 Introduction
 Numbers in general form
 Games with numbers
 Letters for digits
 Tests of divisibility
Extramarks is a trustworthy and reliable source for all the NCERTrelated study material. Students can get the NCERT solutions, revision notes, CBSE mock tests, etc. on our official website.
As we all have come across the phrase “Practice makes a man perfect” and hence to gain mastery in Mathematics, one needs to practise solving mathematical questions on a regular basis. Extramarks is a promising online learning platform that understands the significance of solving problems when it comes to Mathematics.
Our experienced Mathematics faculty experts have prepared questionbank Class 8 Mathematics Chapter 16 Important Questions, after doing proper research and the past years’ question paper analysis. Important Questions Class 8 Mathematics Chapter 16 will provide the students with substantial questions relevant to the chapter Play with Numbers so that they can learn better and practise them for their examinations. Our teachers have given stepbystep instructions for each solution making it easy for students to comprehend and remember the concepts used in these solutions.
Along with Important Questions Class 8 Mathematics Chapter 16, the website of Extramarks also provides the students with the CBSE revision notes, CBSE sample papers, and CBSE past year question papers, strictly abiding by the CBSE syllabus.
Get Access to CBSE Class 8 Maths Important Questions 202223 with ChapterWise Solutions
You can also find CBSE Class 8 Maths ChapterbyChapter Important Questions here:
CBSE Class 8 Maths Important Questions  
Sr No.  Chapters  Chapters Name 
1  Chapter 1  Rational Numbers 
2  Chapter 2  Linear Equations in One Variable 
3  Chapter 3  Understanding Quadrilaterals 
4  Chapter 4  Practical Geometry 
5  Chapter 5  Data Handling 
6  Chapter 6  Squares and Square Roots 
7  Chapter 7  Cubes and Cube Roots 
8  Chapter 8  Comparing Quantities 
9  Chapter 9  Algebraic Expressions and Identities 
10  Chapter 10  Visualising Solid Shapes 
11  Chapter 11  Mensuration 
12  Chapter 12  Exponents and Powers 
13  Chapter 13  Direct and Inverse Proportions 
14  Chapter 14  Factorisation 
15  Chapter 15  Introduction to Graphs 
16  Chapter 16  Playing with Numbers 
Important Questions Class 8 Mathematics Chapter 16 – With Solutions
Given below are a few of the important questions and their solutions those are included in our Mathematics Class 8 Chapter 16 important questions:
Question 1: Write in the normal form 10 × 6 + 5.
 65
 56
 25
 54
Answer 1: (a) 65
Explanation 1: 10 × 6 + 5 = 60 + 5 = 65
Question 2: If the division of N ÷ 5 leaves a remainder of 1, what might be the one’s digit of N?
 1
 Either 7 or 2
 6
 5
Answer 2: (c ) 6
Explanation 2: 5 + 1= 6
Therefore, one’s digit of N is 6.
Question 3: The difference between a twodigit number and the number obtained by reversing its digits is always divisible by ____________
Answer 3: 9
Explanation 3: Taking a and b as the two digits, we get X = ab
On reversing the digits, we get Y = ba
Hence, the sum of digits in X is 10a + b and the sum of digits of Y is 10b + a
On subtracting X and Y, we get
9a – 9b = 9 (ab)
Therefore, the number is divisible by 9
Question 4: A fourdigit number abcd is divisible by 11, if d + b = ___________ or ___________.
Answer 4: a + c or b + d
Explanation 4: Implying the divisibility rule of 11, if abcd is divisible by 11,
then a – b + c – d = 0
Therefore, we get a + b = b + d or each should be zero.
Question 5: A B
+ 3 7
. —————
6 A
—————
Answer 5: Here, we see that B = 5 so that 7 + 5 = 12
Putting 2 at one’s place and carrying over 1 and A = 2, we get
2 + 3 + 1 = 6
This A = 2 and B = 5
Question 6: Find the values of the letters in the following and give reasons for each step involved
 2 A
+ 6 A B
—————————————
A 0 9
—————————————
Answer 6: Taking A = 8 and B = 1, we find that 8 + 1 = 9
On again adding 2 + 8 = 10
Thus, 10’s place will have a 0 and carry over 1.
Now, 1 + 6 + 1 = 8 = A
Therefore, A = 8 and B = 1
Question 7: Express the given number in a normal form:
(2×1000) + (2×10)
Answer 7: e can write (2×1000) + (2×10) in a normal form in the following way
(2×1000) + (2×10) = 2000 + 20 = 2020
Question 8: What is the smallest number you have to add to 100000 to get a multiple of 1234?
Answer 8: 00000 can also be written as 1234 × 81 + 46
Thus, 1234 + 46 = 1188
Hence, the required number is 1188.
Question 9: Check the divisibility of 2146587 by 3.
Answer 9: The sum of the digits of 2146587 is 2 + 1 + 4 + 6 + 5 + 8 + 7 = 33
33 is divisible by 3 since 3 × 11 = 33
Hence, 2146587 is divisible by 3
Question 10: If 31z5 is a multiple of 3, where z is a digit, what might be the values of z?
Answer 10: We are given that 31z5 is a multiple of 3.
Following the divisibility rule of 3,
We understand that the sum of the digits 31z5 need to be divisible by 3 for the number to be divisible by 3.
Which is, 3 + 1 + z + 5 = 9 + z
Therefore, 9 + z will be a multiple of 3
And it will be possible only when 9 + z is any of the values – 0, 3, 6, 9, 12, 15, 18 and further.
If z = 0, then 9 + z = 9 + 0 = 9
if z = 3, then 9 + z = 9 + 3 = 12
if z = 6, then 9 + z = 9 + 6 = 15
if z = 9, then 9 + z = 9 + 9 = 18
So we see that the value of 9 + z can be 9 or 12 or 15 or 18.
Hence we can conclude that 0, 3, 6 or 9 are four possible answers for z.
Question 11: If 24x is a multiple of 3, where x is a digit, what is the value of x?
Answer 11: Given that 24x is a multiple of 3.
Then we know that following the visibility rule off 3, the sum of all the digits of 24x should be a multiple of 3.
2 + 4 + x = 6 + x
Therefore, 6 + x is a multiple of 3, which is possible only when x is one the following numbers – 0, 3, 6, 9, 12, 15, 18 and so on.
X being a digit, the value of x shall either be 0 or 3 or 6 or 9, and the sum shall be either 6 or 9 or 12 or 15, respectively.
Hence, x shall be any of the four values – 0, 3, 6 or 9.
Question 12: A twodigit number is 3 more than 4 times the sum of its digits. If 18 is added to the number, its digits are reversed. Find the number.
Answer 12: Let the unit place digit be x and tens place digit be y.
Therefore, Equation (1) is 10y + x
From the question, a twodigit number is 3 more than 4 times the sum of its digits
Now, the above condition suggests that the Equation (2) is 4(y + x) + 3
Equating equation 1 and 2
4(y + x) + 3 = 10y + x
 4x + 4y + 3 = 10y + x
 3x – 6y = 3
 X – 2y = 1 …equation (3)
Now, the second condition suggests that if 18 is added to the number, it’s digit is reversed
Therefore, Equation 4 is 10x + y
By the given condition,
( 10y + x ) + 18 = 10x + y
 10y + x = 10x + y 18
 9y 9x = 18
 y – x = 2. …equation (5)
Solving equations 3 and 5, we get x = 5 and y = 3.
Benefits of Solving Important Questions Class 8 Mathematics Chapter 16
Mathematics requires a lot of practice for students of Classes 8, 9 and 10. Practice on a daily basis strengthens the roots of every concept. By practising Extramarks Important Questions Class 8 Mathematics Chapter 16, students will be able to have a strong grasp of the concept of the chapter and will also gain enthusiasm for solving all kinds of problems.
Extramarks is one of India’s leading online learning platforms. Its credibility lies in providing reliable, accurate and authentic study materials and solutions. Students and teachers have complete faith and trust in Extramarks. It believes in incorporating joyful learning experiences through its own repository of resources. Extramarks, a top online learning platform, offers complete learning solutions for students in grades 1 and 12.
Following are some benefits of regularly solving questions from our Important Questions Class 8 Mathematics Chapter 16:
 Our team of experienced Mathematics experts have curated a set of questions that covers all topics from Chapter 16. These questions from our Important Questions Class 8 Mathematics Chapter 16 are carefully chosen after analysing all the past years’ papers, NCERT textbooks and exemplars.
 The questions and answers strictly abide by the CBSE syllabus and are in accordance with the CBSE guidelines, so that students can completely count on them.
 Appropriate formulas have been used while answering Chapter 16 Class 8 Mathematics Important Questions for the students to understand and solve the questions in a better way.·
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 CBSE extra questions
Q.1 Find A, B, C in the addition.
$\begin{array}{l}\text{}3\text{}4\text{A}\\ \text{+}3\text{A}\mathrm{B}\\ \overline{\text{}\mathrm{C}\text{}2\text{}9\text{}}\end{array}$
Marks:3
Ans
The addition of A and B is giving 9 i.e., a number whose ones digits is 9. The sum can be 9 only as the sum of two single digit numbers cannot be 19. Therefore, there will not be any carry in this step.
In the next step, 4 + A = 2
It is possible only when A = 8
4 + 8 = 12 and 1 will be the carry for the next step.
1 + 3 + 3 = C
Therefore, C is 7.
We know that the addition of A and B is giving 9. As A is 8, therefore, B is 1.
Q.2 Find a such that the five digit number 91a92 is divisible by 9.
Marks:2
Ans
A number is divisible by 9, if its sum is divisible by 9 i.e. 9 + 1 + a + 9 + 2 is divisible by 9 .
21 + a is divisible by 9
Therefore, the number can be 27, 36, …
But since a is a onedigit number
So, 21 + a = 27
a = 6
Q.3 Find the values of A, B and C in the multiplication.
$\begin{array}{l}\underset{\xaf}{\begin{array}{l}\text{A B}\\ \text{\xd7 5}\end{array}}\\ \text{C A B}\end{array}$
Marks:4
Ans
The multiplication of B and 5 is giving a number whose ones digit is B again. This is possible when B = 5 or B = 0 only.
In case of B = 5, the product, B — 5 = 5 — 5 = 25
2 will be a carry for the next step.
We have, 5 — A + 2 = CA, which is possible for A = 2 or 7
The multiplication is as follows.
If B = 0,
B — 5 = B 0 — 5 = 0
There will not be any carry in this step.
In the next step, 5 — A = CA
It can happen only when A = 5 or A = 0
However, A cannot be 0 as AB is a twodigit number.
Hence, A can be 5 only. The multiplication is as follows.
$\begin{array}{l}\text{}50\\ \frac{\u20145}{250}\end{array}$
Hence, there are 3 possible values of A, B, and C.
(i) 5, 0 and 2 respectively
(ii) 2, 5 and 1 respectively
(iii) 7, 5 and 3 respectively
Q.4 The ones digit of a twodigit number is 3 and the sum of digits is 1/7 of the number itself. What is the number
Marks:2
Ans
Let the two digit number having 3 as its units digit be 10a + 3.
Sum of the digits = a + 3
Now, a + 3 = (1/7)(10 a + 3)
7a + 21 = 10a + 3
3a = 18
a = 6
The number is 63.
Q.5 Check the divisibility of 2147681 by 3.
Marks:1
Ans
2 + 1 + 4 + 7 + 6 + 8 + 1 = 29. Here 29 is not a multiple of 3, so 2147681 is not divisible by 3.
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CBSE Class 8 Maths Important Questions
FAQs (Frequently Asked Questions)
1. How many Important Questions of Class 8 Mathematics Chapter 16 shall a student solve to get properly thorough with the chapter?
A student is supposed to solve all the complex types of questions from the chapter provided by the Important Questions Class 8 Mathematics Chapter 16 to be thorough with the entire chapter. Once all the complex questions are solved, learning the formulas and their applicability becomes easy, and then the chapter shall be at their fingertips.
2. How will Important Questions Class 8 Mathematics Chapter 16 help the students score well in their examinations?
Mathematics requires regular practice for students to strengthen their concepts. Solving questions and doing selfassessments about their strong and weak study areas is a crucial approach to improving Mathematical skills.
Students can rely on Extramarks questionbank such as Chapter 16 Class 8 Mathematics Important Questions to get access to examoriented questions and their solutions. Our experts have picked up extremely helpful questions after thoroughly analysing NCERT books, exemplars and CBSE past year question papers. Students solving these questions on a regular basis can score well in their exams.