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)
= (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)
= (10 × b) + (1 × a) = 10b + a |