Playing with numbers

- Any two-digit number
*ab*, made of digits*a*and*b*, can be written in general form as*ab*= 10*a*+*b*whereas the number*ba*can be written as*ba*= 10*b*+*a*.

For example, 45 = 4 × 10 + 5 and 54 = 5 × 10 + 4

- A three-digit number
*abc*, made of digits,*a*,*b*, and*c*, can be written in general form as*abc*= 100*a*+ 10*b*+*c*.

For example, 456 = 4 × 100 + 5 × 10 + 6

- The sum of a two-digit number and the number formed by reversing the digits is always a multiple of 11.

For example,** **28 + 82 = 110 = 11 × 10 is a multiple of 11.

- The difference between a two-d…

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