English

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. - Mathematics

Advertisements
Advertisements

Question

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 −

Advertisements

Solution

It is given that the number of segments required to form n digits of the kind 

 

is (5n + 1)

Number of segments required to form 5 digits = (5 × 5 + 1)

= 25 + 1 = 26

Number of segments required to form 10 digits = (5 × 10 + 1)

= 50 + 1 = 51

Number of segments required to form 100 digits = (5 × 100 + 1)

= 500 + 1 = 501

shaalaa.com
  Is there an error in this question or solution?
Chapter 12: Algebraic Expressions - Exercise 12.4 [Page 246]

APPEARS IN

NCERT Mathematics [English] Class 7
Chapter 12 Algebraic Expressions
Exercise 12.4 | Q 1.1 | Page 246

RELATED QUESTIONS

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 − 

 


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 −


Write down the following in the product form: 9xy2z


Find a number which when multiplied by 5 is increased by 80.


The sum of three consecutive natural numbers is 114. Find the numbers.


Find two numbers such that one of them exceeds the other by 18 and their sum is 92.


One out of two numbers is thrice the other. If their sum is 124, find the numbers.


Deepak is twice as old as his brother Vikas. If the difference between their ages is 11 years, find their present ages.


Mrs. Goel is 27 years older than her daughter Rekha. After 8 years she will be twice as old as Rekha. Find their present ages.


A man is thrice as old as his son. Five years ago the man was four times as old as his son. Find their present ages.


If I spend f rupees from 100 rupees, the money left with me is ______ rupees.


The side of an equilateral triangle is shown by l. Express the perimeter of the equilateral triangle using l. 


The side of a regular hexagon is denoted by l. Express the perimeter of the hexagon using l. 

(Hint: A regular hexagon has all its six sides equal in length.)


To find sum of three numbers 14, 27 and 13, we can have two ways:

  1. We may first add 14 and 27 to get 41 and then add 13 to it to get the total sum 54 or
  2. We may add 27 and 13 to get 40 and then add 14 to get the sum 54. Thus, (14 + 27) + 13 = 14 + (27 + 13)

This can be done for any three numbers. This property is known as the associativity of addition of numbers. Express this property which we have already studied in the chapter on whole numbers, in a  general way, by using variables a, b and c.


The expression for the number of diagonals that we can make from one vertex of a n sided polygon is ______.


The length of a side of square is given as 2x + 3. Which expression represents the perimeter of the square?


In a rectangular plot, 5 square flower beds of side (x + 2) metres each have been laid (see the figure). Find the total cost of fencing the flower beds at the cost of ₹ 50 per 100 metres:


The sum of the multiplication table of natural number ‘n’ is given by 55 × n. Find the sum of table of 10.


If = 2x + 3,  = `3/2x + 7` and  = x – 3 then find the value of:

`1/2` + – 3


If = `3/4x - 2` and = x + 6, then find the value of:


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×