NCERT Exemplar Class 8 Maths Chapter 13: Playing with Numbers. NCERT Exemplar Solutions for Class 8 Maths Chapter 13 Playing with Numbers prepare students for their Class 8 exams thoroughly.
Maths problems and solutions for the Class 8 pdf are provided here which are similar to the questions being asked in the previous year’s board.
Contents
NCERT Exemplar Class 8 Maths Chapter 13: Playing with Numbers
Class 8: Maths Chapter 13 solutions. Complete Class 8 Maths Chapter 13 Notes.
Main Concepts and Results
- Numbers can be written in general form. For example, a two digit number ab is written as ab = 10a + b; a three digit number abc is written as abc = 100a + 10b + c
- The general form of numbers are helpful in solving various problems related to numbers.
- Rationale for the divisibility of numbers by 11, 10, 5, 2, 9 or 3 can be explained by writing the numbers in general form.
- Many number puzzles involving different letters for different digits are solved using rules of number operations.
Solved Examples
In examples 1 to 4, out of four options only one is correct. Write the correct answer.
In examples 5 to 7, fill in the blanks to make the statements true.
In examples 8 to 10, state whether the statements are true (T) or false (F).
Think and Discuss
- . What would be the value of y, if 277y is divisible by 11?
Multiple Choice Questions
Fill in the Blanks Type Questions
True False Type Questions
Short Answer Type Questions
Applications, Games and Puzzles
1. Polygonal Numbers
Study the patterns given below and extend it. We already know about
square numbers.
Draw two more.
Here for the first square number, use 1² ; for the second square number, use 2² . To find the third square number use 3² and so on. Write the nth square number.
Now let’s move to triangular numbers.
Find the next triangular number.
o find the nth triangular number we use the formula
Are you familiar with pentagonal numbers?
First three are given to you. Write the next one
Draw the dot patterns for the next pentagonal number. Count the number of dots inside the entire shape and write the number under the shape.
2. Put tick mark in the appropriate boxes if the given numbers are divisible by any of 2, 3, 4, 5, 6, 8, 10, 11 numbers.
3. Cross Number Puzzle
Fill in the blank spaces in the cross number puzzle using following clues.
Down
(a) 59 ______ 63 ÷ 33
(b) 81 ______ 42 ÷ 6
(c) 7 ______ 6988 ÷ 11
(d) 37604 ______ 5 ÷ 15
(e) 56 ______ ÷ 10
Across
(f) 90 ______ 815 ÷ 15
(g) 3514 ______ ÷ 12
(h) 4 ______ 07 ÷ 7
(i) 8 ______ 558 ÷ 6
(j) 6 ______ 5 ÷ 55
Click here to download the NCERT Exemplar Class 8 Maths Unit 13 Playing with Numbers
Answers to Multiple Choice Questions
Activity
1. 3, 5, 9
2. 2, 3, 6, 9
3. 2, 5, 10
4. 2, 3, 6, 9, 11
5. 2, 4, 8