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Communicate modeling steps clearly
Worksheet
Grade Level
Geometry
GEO.190 Communicate modeling steps clearly
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A rectangular wall is 8 ft by 9 ft. It needs two coats of paint. One gallon covers 350 square ft. Which explanation most clearly communicates the paint amount?
A
The wall area is 8 x 9 = 72 square ft. Two coats require 144 square ft of coverage, and 144/350 is about 0.41 gallon, so at least 0.41 gallon is needed; if buying whole gallons, buy 1 gallon.
B
The wall area is 72 square ft, so exactly 72 gallons are needed.
C
Use perimeter 2(8 + 9) = 34, so 34/350 is about 0.10 gallon for two coats.
D
Use 8 x 9 x 2 x 350 = 50,400 gallons because the coverage number should be multiplied.
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