Playing With Numbers
In your previous class you have studied about various types of
numbers such as Natural numbers, Whole numbers, Integers, Rational
numbers and the various properties such as closure, associative,
commutative and distributive. The number in the general form can be written as for example 26 = 2x10 +6. The general form of a 2-digit number 
is 
.
The sum of a 2-digit number and the number obtained by interchanging
its digits is always divisible by 11. The difference between a
2-digit number and the number obtained by interchanging its digits is
always divisible by 9.
The general form of a 3-digit number
is 
. The difference between a 3-digit number and a number obtained by reversing its digits is always divisible by 99. 
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