Unit 1 Basic Principles of Whole Numbers
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Add the values of each digit to determine the value of the whole number.
The digit 5 is in the thousands column 5 × 1,000 = 5,000
The digit 6 is in the hundreds column 6 × 100 = 600
The digit 9 is in the tens column 9 × 10 = 90
The digit 4 is in the ones column 4 × 1 = + 4
‾
= 5,694
Math Tip
To make numbers easier to read, a comma is inserted after every third digit counting
from the right.
What are the place values of the digits in the number 5,298,347?
, , 5 2 9 8 3 4 7
Millions
Hundred Thousands
Ten Thousands
Thousands
Hundreds
TensOnes
Example 1-1
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Sometimes a zero is one of the digits within a whole number. Regardless of where
it is located in the number, its place value remains zero.
What is the place value of the zero in the whole number 2,084?
The zero is in the hundreds column, so then 0 × 100 = 0.
The whole number would be read as two thousand eighty-four.
Example 1-2
Rounding Whole Numbers
There are times when whole numbers do not need to be exact. When calculating
material estimates for a project or cost estimates for a quote, numbers can be rounded
to a specifi c place value. Rounding numbers is the process of increasing or decreasing
the value of the number to a specifi c place value. When calculating the area of the roof
in the image below, the 1,382 sq ft roof would be rounded to 1,400 sq ft for estimating
or purchasing the material. Because shingles are sold by the square (100 sq ft), the area
of the roof is rounded up to the next full square.