Unit 1 Basic Principles of Whole Numbers
5
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Round the number 16,841 to the hundreds place value.
The number in the hundreds place value is 8.
16,841
The digit to the right of the 8 is 4.
16,841
Since the 4 is less than 5, the 8 is not changed but the remaining numbers to the
right are changed to zero.
16,800
Example 1-4
Denominate Numbers
When working in construction, numbers will often be associated with a unit of
measurement. Numbers consisting of a numeric value and a unit of measure are
referred to as denominate numbers. Carpenters work with denominate numbers in
every phase of the construction process from site prep to framing to fi nal fi nish. For
example, 32′ and 64′ are denominate numbers because they include a value (32 and 64)
and a unit of measure (feet). Other examples include:
▪
15 lb
▪ 64 sq ft
▪
3 hours, 14 minutes, 45 seconds
▪ 2 tons, 600 pounds
Carpentry Notes
Paint Estimation
During the finishing stages of construction, carpenters take room measurements
and purchase the appropriate quantity of paint for the walls and ceilings. This is one
occasion when carpenters take exact calculations, and then round the number up.
Rounding up will help cover any extra paint needed for touch-ups or mistakes. How
many gallons of paint are needed for a 764 sq ft room?
764 sq ft can be rounded up to the nearest hundreds place value. 7 is in the hundreds
place value. Rounding this up to 8 gives you 800 sq ft. Since 1 gallon of paint will cover
an area of 400 sq ft, 2 gallons of paint are needed for this project.