## Prealgebra (7th Edition)

When a whole number is multiplied by a power of 10, the number of zeroes in the power of ten are added on the right side of the whole number to fill in up to the new decimal. $123\times10=123\underset{\smile}\!\!\!\!\!\!.0.=1230$ Similarly, the decimal is moved when the factor multiplied by a power of 10 is not a whole number. $12.3\times10=12\underset{\smile}\!\!\!\!\!\!.3.=123$