Forming Linear Equations - Two digit number

Chapter 2 Class 8 Linear Equations in One Variable
Concept wise

Let’s take an Example

54 is a 2 digit number.

Digits at ten places = 5

Digit at units place = 4

So, the number will be

Number = (10 × Digits at ten place) + (1 × Digit at units place)

= (10 ×  5) + (1 ×  4)

= 50 + 4

= 54

To generalize

 Number Digits are interchanged Let number be     ab   So, Digit at tens place = a   & Digit at unit place = b   Number   = (10 × Digit at tens place)         +  (1 × Digit at units place)      = (10 × a) + (1 × b) = 10a + b Thus, number will be     ba   So, Digit at tens place = b   & Digit at unit place = a   Number   = (10 × Digit at tens place)         +  (1 × Digit at units place)      = (10 × b) + (1 × a) = 10b + a

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#### Davneet Singh

Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 14 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.