A number that is written as a sum of single-digit multiples of powers of 10 is called its decimal representation. In this context, each single-digit multiple (from 0 to 9) corresponds to the coefficients of the powers of 10, which represent the place values of the digits in a number. For example, the number 357 can be expressed as:
\[ 3 \times 10^2 + 5 \times 10^1 + 7 \times 10^0 \]
This representation is fundamental in the decimal number system.