• Skip to main content
  • Skip to secondary menu
  • Skip to primary sidebar
  • Skip to footer

CBSE Tuts

CBSE Maths notes, CBSE physics notes, CBSE chemistry notes

  • NCERT Solutions
    • NCERT Solutions for Class 12 English Flamingo and Vistas
    • NCERT Solutions for Class 11 English
    • NCERT Solutions for Class 11 Hindi
    • NCERT Solutions for Class 12 Hindi
    • NCERT Books Free Download
  • TS Grewal
    • TS Grewal Class 12 Accountancy Solutions
    • TS Grewal Class 11 Accountancy Solutions
  • CBSE Sample Papers
  • NCERT Exemplar Problems
  • English Grammar
    • Wordfeud Cheat
  • MCQ Questions

NCERT Solutions for Class 7 Maths Chapter 12 Algebraic Expressions Ex 12.4

CBSE students can refer to NCERT Solutions for Class 7 Maths Chapter 12 Algebraic Expressions Ex 12.4 Textbook Questions and Answers are provided by experts in order to help students secure good marks in exams.

Class 7 Maths NCERT Solutions Chapter 12 Algebraic Expressions Ex 12.4

Question 1.
Observe the patterns of digits made from line segments of equal length. You will find such segmented digits on the display of electronic watches or calculators. If the number of digits formed is taken to be n, the number of segments required to form n digits is given by the algebraic expression appearing on the right of each pattern. How many segments are required to form 5,10,100 digits of the kind?
NCERT Solutions for Class 7 maths Algebraic Expreesions img 21

(a)
NCERT Solutions for Class 7 maths Algebraic Expreesions img 18
Solution:
We know that the number of segments required to form n digits of the kind NCERT Solutions for Class 7 maths Algebraic Expreesions img 22 is (5n + 1).Therefore, to form 5,10,100 digits of above kind the number of segments required are (5 × 5 + 1) = 25 + 1 = 26, (5 × 10 + 1) = 50 + 1 = 51 and t (5 × 100 + 1) = 500 + 1 = 501, respectively.

(b)
NCERT Solutions for Class 7 maths Algebraic Expreesions img 19
Solution:
(b) We know that the number of segments required to form n digits of the kindNCERT Solutions for Class 7 maths Algebraic Expreesions img 23 is (3n + 1). Therefore, to form 5, 10, 100 digits of above kind the number of segments required are (3 × 5 + 1) = 15 + 1 =16, (3 × 10 +1) = 30 + 1 = 31 and (3 × 100 +1) = 300 +1 = 301 respectively.

(c)
NCERT Solutions for Class 7 maths Algebraic Expreesions img 20
Solution:
We know that the number of segments required to form n digits of the kind NCERT Solutions for Class 7 maths Algebraic Expreesions img 24 is (5n + 2). Therefore, to form 5, 10, 100 digits of above kind the number of segments required are (5 × 5 + 2) = 25 + 2 = 27, (5 × 10 + 2) = 50 + 2 = 52 and (5 × 100 + 2) = 500 + 2 = 502 respectively.

Question 2.
Use the given algebraic expression to complete the table of number patterns :
NCERT Solutions for Class 7 maths Algebraic Expreesions img 15
Solution:
The completed table of number patterns is as given below :
NCERT Solutions for Class 7 maths Algebraic Expreesions img 16
NCERT Solutions for Class 7 maths Algebraic Expreesions img 17

Primary Sidebar

NCERT Exemplar problems With Solutions CBSE Previous Year Questions with Solutoins CBSE Sample Papers
  • The Summer Of The Beautiful White Horse Answers
  • Job Application Letter class 12 Samples
  • Science Lab Manual Class 9
  • Letter to The Editor Class 12 Samples
  • Unseen Passage For Class 6 Answers
  • NCERT Solutions for Class 12 Hindi Core
  • Invitation and Replies Class 12 Examples
  • Advertisement Writing Class 11 Examples
  • Lab Manual Class 10 Science

Recent Posts

  • Understanding Diversity Question Answer Class 6 Social Science Civics Chapter 1 NCERT Solutions
  • Our Changing Earth Question Answer Class 7 Social Science Geography Chapter 3 NCERT Solutions
  • Inside Our Earth Question Answer Class 7 Social Science Geography Chapter 2 NCERT Solutions
  • Rulers and Buildings Question Answer Class 7 Social Science History Chapter 5 NCERT Solutions
  • On Equality Question Answer Class 7 Social Science Civics Chapter 1 NCERT Solutions
  • Role of the Government in Health Question Answer Class 7 Social Science Civics Chapter 2 NCERT Solutions
  • Vital Villages, Thriving Towns Question Answer Class 6 Social Science History Chapter 9 NCERT Solutions
  • New Empires and Kingdoms Question Answer Class 6 Social Science History Chapter 11 NCERT Solutions
  • The Delhi Sultans Question Answer Class 7 Social Science History Chapter 3 NCERT Solutions
  • The Mughal Empire Question Answer Class 7 Social Science History Chapter 4 NCERT Solutions
  • India: Climate Vegetation and Wildlife Question Answer Class 6 Social Science Geography Chapter 8 NCERT Solutions
  • Traders, Kings and Pilgrims Question Answer Class 6 Social Science History Chapter 10 NCERT Solutions
  • Environment Question Answer Class 7 Social Science Geography Chapter 1 NCERT Solutions
  • Understanding Advertising Question Answer Class 7 Social Science Civics Chapter 7 NCERT Solutions
  • The Making of Regional Cultures Question Answer Class 7 Social Science History Chapter 9 NCERT Solutions

Footer

Maths NCERT Solutions

NCERT Solutions for Class 12 Maths
NCERT Solutions for Class 11 Maths
NCERT Solutions for Class 10 Maths
NCERT Solutions for Class 9 Maths
NCERT Solutions for Class 8 Maths
NCERT Solutions for Class 7 Maths
NCERT Solutions for Class 6 Maths

SCIENCE NCERT SOLUTIONS

NCERT Solutions for Class 12 Physics
NCERT Solutions for Class 12 Chemistry
NCERT Solutions for Class 11 Physics
NCERT Solutions for Class 11 Chemistry
NCERT Solutions for Class 10 Science
NCERT Solutions for Class 9 Science
NCERT Solutions for Class 7 Science
MCQ Questions NCERT Solutions
CBSE Sample Papers
NCERT Exemplar Solutions LCM and GCF Calculator
TS Grewal Accountancy Class 12 Solutions
TS Grewal Accountancy Class 11 Solutions