Whole Number and Decimal Place Values
We will begin our review of place values with a look at whole numbers. When writing
large numbers it is common practice to separate them into groups of three using commas as the
separator. When separating into groups of three, start from the right and count toward the left.
2 3 , 9 2 1 , 7 7 4
The following is a chart showing this separation and how the groups are labeled.
Billions Millions Thousands Units
4 3 2 , 5 6 1 , 9 6 3 , 8 7 5
Each digit within each group of three has its own individual place value. Therefore, digits
put in different places, as well as different groups, take on different values. Consider the
assigned values to the group of three in the following example.
EXAMPLE 1: Write 444 in words.
SOLUTION: 4 4 4
È È È
4 hundreds 4 tens 4 ones
È È È
four hundred forty - four
When reading large numbers each group of three is read individually followed by its group
Let's look at a couple of examples of large numbers and how they would be written in
EXAMPLE 2: Write 527904 in words
SOLUTION: First separate the number into groups of three counting from right to left:
5 2 7 , 9 0 4