elementary number theory - Decimal Representation vs Decimal Expansion

What does it mean when they ask you to write the decimal representation of a number.

Looking it up Google for a while,

On some pages, it means to write the value of the number. While on others it means to write it in a form of series.
What does it mean when I say, find the decimal representation of $\dfrac{123456}{100}$
Does it mean $1234.56$ or $1 \cdot 10^3 + 2 \cdot 10^2 + 3 \cdot 10^1 + 4 \cdot 10^0 + 5 \cdot 10^{-1} + 6 \cdot 10^{-2}$?

Also what is the difference between Decimal Expansion and Decimal Representation?