In common use, a decimal refers to part of a whole number. The numbers to the left of a decimal point represent whole numbers, and each number to the right of a decimal point represents a fractional part of a power of one-tenth. For instance: The decimal value 1.24 indicates 1 whole unit, 2 tenths, and 4 hundredths (commonly described as 24 hundredths).
A decimal point is a period that separates the complete units from the fractional parts in a decimal number.
Expanded form refers to a base and an exponent written as repeated multiplication.
The whole numbers are all positive counting numbers and zero. The whole numbers are 0, 1, 2, 3, ...